Here is the full list of all 12 Bass Monkey achievements.
Find and Attack DJ's Boombox.
Complete the 1st song.
Get the combo meter up to 999.
With "Friendly Fire" mode turned on, attack a friend!
Complete the 3rd song.
Complete the game without destroying any hamsters.
Complete the game without getting destroyed.
Respawn after getting destroyed.
Play with 3 friends.
Complete the game with 5 stat points in the health stat.
Complete the game with 5 stat points in the strength stat.
Complete the game.