Easy "Collect 1000 berries" and "Collect 3000 berries" achievements:
This requires a game controller or rebinding the "BackPack360" command to a key. After finishing the first level using the path, play it again, however this time press L2 if using an Xbox 360 controller, or Select if using a PlayStation3 controller. Each time you return the level selection screen you will get the same amount of berries as you collected during your first run.
Complete the following tasks to unlock the corresponding achievement. To view
your achievements and stats in Steam, select "Community", then "My profile",
then "View all my games", then the game and view stats.
Achievement - How to unlock:
Beat the game - Beat the game.
Collect 1000 berries - Collect 1000 berries.
Collect 3000 berries - Collect 3000 berries.
Complete the first level - Complete the first level.
Play with a friend! - Play with a friend!.
Unlock the orange leaf - Unlock the orange leaf.
Unlock the white leaf - Unlock the white leaf.
Unlock the yellow leaf - Unlock the yellow leaf.