Logan duplication glitch:
As Logan, hold down the aim button (left trigger) and hold down the fury button while aiming at multiple zombies. Then, pull the right trigger. Instead of logan using his knives, he will be throwing your equipped weapon. Throwing the weapons will cause the game to duplicate your equipped item.
Easy money hints:
At the warehouse, get the Hammer and Baseball Bat, then fast travel to the Church and sell them to get about $400. Go back to the Warehouse and the Hammer and Baseball Bat will have respawned. Repeat this as many times as you can. Note: You must be in the City and have discovered both the Church and the Warehouse to do this trick.
Infinite Diamonds hint:
On Level 7, you can get a Diamond from the safe in the Mayor's office. If you go back into the sewers, but then turn round and check the safe again, the Diamond should ahve spawned back in there again. Sell the diamonds for tons of money.
Dead Island annoyingly only saves at pre-determined points (though this arguably makes it more addictive). To get it to save whenever you want, go to the Controls menu and change the layout from Analog to Digital or Digital to Analog. This causes the game to autosave. You can then obviously change the controls back and carry on playing.
Item duplication hint:
Note: This must be done in solo mode. When you reach a checkpoint during any campaign quest, drop the item on the ground you want to duplicate (if you want, all your items in your inventory). Then, kill yourself by using deobombs or molotovs, When the respawn timer starts counting down, pause the game and reload your checkpoint. When you respawn, all the weapons you dropped will be back in your inventory and also still be laying on the ground where you dropped them. You also do not suffer the cash penalty from dying since you reloaded the checkpoint.
"Oh, No You Don't" achievement hint:
Note: This can only be unlocked with Sam B after unlocking his Tackle ability. Play Chapter 16, "Locked Up". Once you reach the checkpoint where you have to "Find another way to the cell block control room", go around to get to the control room. When you open the door to the cell blocks, there is a stairway going down and there you will see the Ram. Let him follow you upstairs and go back in the hallway. Leave the door open. The Ram will try to ram you down, but he won't be able to get past the door. This is where you can weaken him until his life is close to dead. Then, deliver the final blows with you Tackle ability.
Warranty Void if Used
Objective: Create a customized weapon.
A taste of everything
Objective: Kill a zombie with 10 different melee weapons.
Need a hand?
Objective: Join another player's game.
Objective: Breach a locked door with the first blow.
Learning the ropes
Objective: Reach level 10.
Objective: Kill 50 zombies using a vehicle.
Objective: Travel a distance of 20 kilometers on foot.
Together in the light
Objective: Complete 5 quests in a single co-op game with the same partners.
Objective: Drive a total distance of 10 kilometers.
Hell in paradise
Objective: Complete act 1.
Objective: Create weapons to rival the gods of fire or thunder.
Objective: Save 5 people besieged by zombies.
To put it bluntly
Objective: Kill 250 zombies using blunt melee weapons.
Objective: Complete 25 quests while playing with at least one co-op partner.
Tis but a flesh wound!
Objective: Sever 100 limbs.
Tae Kwon Leap
Objective: Kill 25 zombies with your bare fists.
Hack & slash
Objective: Kill 250 zombies using edged melee weapons.
Objective: Reach level 25.
Objective: Kill 50 human enemies.
Objective: Play in a co-op team of 4 different playable characters.
Objective: Kill a Suicider with a grenade.
Busy, busy, busy
Objective: Finish 75 quests cumulatively.
Gotta find'em all
Objective: Find 60 collectibles.
A very special day
Objective: Kill 250 zombies with modified weapons.
No raccoons in here
Objective: Complete act 2.
Menage et Trois
Objective: Complete 5 quests with 3 co-op partners.
One is all I need
Objective: Kill 5 Infected in a row with a single blow.
I want one of those
Objective: Customize 25 weapons
King of the jungle
Objective: Complete act 3.
Objective: Complete act 4.
Can't touch this
Objective: Use a hammer to kill a series of 15 zombies without taking damage.
Objective: Kill 100 enemies with Fury attacks.
Objective: Play with 10 different co-op partners for at least 15 minutes each.
Guns don't kill but they help
Objective: Kill 250 zombies using firearms.
Objective: Find 120 collectibles.
Ah! Spoiled meat!
Objective: Kill a Butcher using an axe
Objective: Kill an Infected with a grenade blast.
Rootin' Tootin' Lootin'
Objective: Loot 25 Exceptional Weapons.
Objective: Use a large medkit to heal an injury of 5% or less.
Swing them sticks
Objective: Kill 150 enemies using Analog Fighting controls.
Oh, no you don't
Objective: Kill a Ram using tackle skill.
10 heads better than 1
Objective: Kill 10 zombies in a row with headshots.
Objective: Heal yourself with a medkit 100 times.
School of hard knocks
Objective: Reach level 50
There and back again
Objective: Explore the entire island.
How many days exactly?
Objective: Play Dead Island at least 28 days after starting it for the first time.
Light my fire
Objective: Set 10 zombies on fire simultaneously.
Right 4 Life
Objective: Complete act 1 with 4 different characters
Dead Island: Bloodbath Arena
Complete a set (15) - Kill enemies of 6 different types during a single round.
Death Incarnate (50) - Survive wave 30.
Extreme Firefighting (25) - Set 5 enemies on fire and then kill them with explosives.
Fancy (25) Survive 10 - consecutive waves using only custom weapons.
Gladiator school (25) - Survive 15 consecutive waves with each of the 4 characters.
Looking for trouble (15) - Survive 5 waves in each of the 4 Arenas.
Morituri te salutant (30) - Survive 30 consecutive waves with at least one co-op player.
Out of honey? Chew bees! (25) - Survive 5 waves using only your fists and legs.
Stick it to the enemy (30) - Survive 15 consecutive waves using the analog combat controls.
Wave and Smile (10) - Play any Arena in co-op.