Begin a new game on the Insane difficulty setting and play through the Prologue area until you destroy the Comms Tower, partway through. Blast the bunker with grenades, and grab a new set of grenades to make the next area easier. Open the door, proceed to the main gate, and initiate a cutscene by interacting with the panel. Keep going to the next area. As you come through the gate, you should find three enemies. Kill them and then sprint toward the stairs. Before you reach them, however, turn toward the right. You should see a gate starting to close. Dive under it before it is done closing and you will find a container to your left. It contains a special freeze ray weapon that should remind you of the one used in the Despicable Me cartoon, although it unfortunately doesn't come with enough ammunition to be especially useful throughout the remainder of the game.
On any difficulty level, play through the campaign until you reach the greenhouse in Act 2 of Chapter 2. There, destroy two waves of enemies. Around you, there also are tomato plants growing in pots. Make sure that you destroy every last one of the pots before leaving the building, precious though the plants are to their owner. A lot of the pots are positioned out in the open, on tables, but make sure that you don't miss the pot located on a high shelf. When every last pot has finally been destroyed, you'll know it because Marcus will start an extended, profanity-laced rant. When it concludes, head toward the building's exit and you should spot a new tomato plant. Investigate it to receive Dom's Toms, special saucy grenades that function like standard ones but look very different.
Easy "Gone With The Windflare" achievement
You can get this achievement through natural progression of the campaign, but it can easily be obtained during Act 2 - Chapter 3: Plan B. When you reach a section where they ask you to choose between two paths (left or right), choose the left path. After spawning, there will be enemies in front of you with some bales of hay being held by a wooden gate. Shoot this wood to release the hay and kill the enemies. Then, look across the river/creek and do the same on the other side to kill a total of 4-5 enemies. Reload the last checkpoint and repeat this process until you get the "Gone With The Windflare" achievement. You can take turns if you are playing in co-op.
Easy "Stop Hitting Yourself" achievement
During the last wave of the "Horde" in Act I - Chapter 4: A Few Snags, a single Guardian will spawn marked with a short cutscene. Kill him, and he will drop his weapon where he crashes. Quickly go to his frame, and pull out the Salvo. Shortly afterwards, two more guardians will appear. Use the Salvo heavy weapon to kill one of the Guardians to get the "Stop Hitting Yourself" achievement. If you have any issues, try playing on a lower difficulty. It is also possible to get this achievement in Horde 3.0 mode since Guardians spawn during some waves. You can also pick up the Salvos from the bonus challenge weapon crates to make it easier.
Easy "Whoomp, There It Is!" achievement
This can be done during any part of the campaign. It can easily be completed in co-op or versus with another player. It can be done solo, but it is a lot harder to steal a kill from one of the AI. To do this, take cover across from an enemy on a shallow object. Press Forward, then X to pull them over the cover. Once they are pulled over, stay close to them and press Y to execute them. While playing in co-op, have one player pull an enemy over cover, then have the other player execute them to get the "Whoomp, There It Is!" achievement. Have the player that did not get the achievement do the execution next so both players get the achievement. An easy place to do this is during the "Yank & Shank" tutorial in Act I - Chapter 1.
In the Harbor multiplayer map, shoot the six little Leviathan statues around the map in a specific order, then activate the switch at the Longshot spawn to get a giant Leviathan to jump out of the water.
Hidden Cole Train audio cue
During the Act V sequence where you command a giant DB mech and are fighting through the Swarm enemies toward the dam, you will get a tooltip to press a button to perform a melee kick. Kick the car on the left ledge through the "V" shaped trees and fireworks will spark from the trees and you will hear a hear a short Cole Train audio cue.
Marcus the Babysitter
If you pay attention to the screens in the Prologue, you'll notice the man in the lab coat (who is obviously Baird) had a conversation with a person named "VINTER." This is an example of Marcus checking in with Baird to see how JD is doing. Baird also has a conversation with First Minister Jinn, which is on the screen after you play through the Prologue.
While you're running through the graveyard in Act 3's Chapter 2 - Night Terrors, you can find a tombstones with the letters MA, R, I, and A etched in them.
Riding a Locust Reaver
In Act 1 - Chapter 0: Prologue, reach the section where you must defend the House Of Sovereigns on E-Day. Kill the Corpser with the Hammer Of Dawn to view a cutscene. Defeat the wave of Locust soldiers and Boomers that spawn afterwards. A Locust Reaver will land after this wave. Once the Reaver lands, kill the pilot of the Reaver, then quickly run underneath the Reaver and press the indicated key to climb on and control it. Note: If you want too long, the Reaver will automatically die. While riding the Reaver, you can fire rockets and kill the other Reaver in the area. You can also mount and dismount as often as desired.
Complete the indicated task to unlock the achievement.
Achievement How to unlock
And We're Back (5 points) Completed the Prologue and watched opening credits.
And You Said We Couldn't Fly (5 points) Rode the ore transporter counterweight cable.
As If Snatchers Weren't Bad Enough (5 points) Survived the Pouncer ambush outside of the tram station.
Betty's My Kind of Girl (5 points) Fought your way to the Dam using Jack Jr. and Second Betty.
Broadcast This! (5 points) Defeated the Speaker and his Swarmak mount.
Jinn's Overreaction (5 points) Defeated the Vulture while riding on a Track Mule.
Long Enough We'll Need This (5 points) Defended the Speyer Radio Tower while waiting for backup.
Looks Like an Elevator to Hell (5 points) Rode the ore transporter to the bottom of the mine.
Not Going to Stop Us, Right? (5 points) Defeated the Hive Boss.
One Hell of an Exhibit (5 points) Survived the onslaught of Swarm while holding up in the museum.
Raiding is what Outsiders Do (5 points) Liberated a Fabricator from Settlement 5.
Still Not Ironic (5 points) Restored power to the Dam by resetting the generators.
Warriors, Kings....Wizards. (5 points) Survived the King's chamber and discovered a way out of the catacombs.
Welcome Home (5 points) Escaped from your childhood home.
When it Leads to War (5 points) Defended your Outsider Village from the COG.
You Smell Bad (5 points) Rescued Marcus from the Snatcher pod.
Complete the indicated task to unlock the achievement.
Achievement How to unlock
At First I Was Afraid, I Was Petrified (10 points) Survived the first 10 consecutive waves of Horde in a squad.
Big Ol Hero (5 points) Got the "Big Ol Hero" Ribbon ten times.
Bilford Bogin! (25 points) Completed 50 consecutive waves of Horde in a squad.
Bounty Hunter (10 points) Completed 20 Bounties.
Brothers Till The End (20 points) Completed all Campaign Acts in Co-op (any difficulty).
But You Can't Pick Your Family (5 points) Found 5 weapons in snot bubbles.
Call a Dr. If Lasting More than 4 Teammates (5 points) Resurrected 4 teammates using the Fabricator.
Chest Candy (10 points) Earned one of each launch Ribbon.
Classy Move (5 points) Reached level 10 in one Horde class.
Collector (5 points) Recovered 5 Campaign collectibles.
Come And Knock on My Door (5 points) Completed one Act in Co-op Campaign.
Completist (15 points) Recovered all Campaign collectibles.
Craftsman (5 points) Crafted a card.
Custom Made (5 points) Won a Match using a non-Starter Character and non-default Weapon Skin.
Drop the Beat...down. (5 points) Got 3 Dropshot headshots.
Give a Name. Any Name. (20 points) Completed 50 consecutive waves of Horde as Sniper on Insane in a squad (any map).
Gold Digger (10 points) Spent 100,000 power in the Fabricator (across all sessions).
Gone With The Windflare (5 points) Killed 15 enemies using the environment during a windflare.
How's it Going to Work? Teamwork! (5 points) Won a Casual Co-op Versus match.
I Choose Violence (20 points) Completed 50 consecutive waves of Horde as Heavy on Insane in a squad (any map).
I Have Approximate Knowledge of Many Things (20 points) Completed 50 consecutive waves of Horde as Scout on Insane in a squad (any map).
I Have a Very Particular Set of Skills (5 points) Upgraded a Skill Card to maximum level.
I Live. I Die. I Live Again! (5 points) Rescued someone from inside a Snatcher.
I'm Drumpf (20 points) Earned 100000 Credits lifetime.
I've Killed Things, Seen Places (50 points) Completed 50 consecutive waves of Horde in a squad on every Launch Series map.
It's a Start (5 points) Earned 1000 Credits lifetime.
Job's Done (20 points) Completed 50 consecutive waves of Horde as Engineer on Insane in a squad (any map).
Killdozer (5 points) Ran over 15 enemies with the Loader.
Learned the Hard Way (20 points) Completed all Campaign Acts on Hardcore or Insane difficulty.
Level 10 (10 points) Reached level 10.
Level 50 (25 points) Reached level 50.
Look out! Uh... Never Mind (5 points) Killed 25 enemies by dropping pods on them.
Master Craftsman (10 points) Crafted a Legendary card.
Moving on up! (10 points) Earned 10000 Credits lifetime..
Now That's a Knife! (5 points) Killed 10 enemies with combat knife after yanking or kicking.
Oh What a Day! What a Lovely Day! (20 points) Completed 50 consecutive waves of Horde as Soldier on Insane in a squad (any map).
Pack Rat (10 points) Recovered 10 Campaign collectibles.
Please Sir, Can I Have Some More? (100 points) Re-upped ten times.
Pounsus Interruptus (5 points) Killed a Pouncer mid-pounce with Shotgun or Chainsaw.
Ranked and Filed (5 points) Achieved a rank in all launch Core and Competitive game modes.
Ready for More (10 points) Completed all Campaign Acts.
Remember the Fallen (15 points) Recovered all COG Tags in Campaign.
Rollin' With the Homies (5 points) Earned the maximum Consecutive Match Bonus in Versus.
Say Hello to My Little Friend (5 points) Got the final winning kill in Arms Race.
Seriously 4.0 (200 points) Completed Insane Campaign, ribbons, rank placements, Horde maps, re-ups, classes and five skills.
Skills That Make Me a Nightmare (10 points) Upgraded 5 Skill cards to maximum level.
Stay Classy (10 points) Reached level 10 in every launch Horde class.
Stop Hitting Yourself (5 points) Killed a Guardian with a Guardian weapon.
Sugar Daddy (10 points) Deposited 1,000,000 power in the Fabricator lifetime.
Talent Gets Kills, Teamwork Wins Games! (5 points) Won a Hardcore Co-op Versus match.
Tea. Earl Grey. Hot. (5 points) Upgraded Fabricator to maximum level.
Teamwork Makes the Dream Work! (5 points) Won a Normal Co-op Versus match.
Thank You, Sir. May I Have Another? (10 points) Re-upped once.
The Night is Dark and Full of Terrors (30 points) Completed all Campaign Acts on Insane difficulty.
The Sound Of Silence (25 points) Carried the Customized Lancer Marcus gave you to the end of Act V Chapter 2.
To Go Fast, Go Alone. To Go Far, Go Together (5 points) Won an Insane Co-op Versus match.
Triple Play (5 points) Killed 3 enemies with a single Buzzkill shot.
Whoomp, There It Is! (5 points) They Yanked, you Shanked.
Zen and the Art of Reloading (5 points) Perform 25 perfect active reloads.