Here is the full list of all 27 Iffy Institute achievements.
Kill your enemies 1000 times!
Kill your enemies 500 times!
Kill your enemies 100 times!
Kill your enemies 50 times!
Kill your enemies 10 times!
Collect 15 pick ups in one game!
Play every map and every character!
Kill an enemy with the help of a swimming log!
Let 3 barrels explode at once!
Let 7 barrels explode at once!
Let 10 barrels explode at once!
Die 10 times without the help of other players!
Die 50 times without the help of other players!
Die 100 times without the help of other players!
You know what to do... are you okay?
Kill 10 enemies with your tackle ability!
Kill 20 enemies with your tackle ability!
Kill 50 enemies with your tackle ability!
Kill 100 enemies with your tackle ability!
Kill 500 enemies with your tackle ability!
Kill 10 enemies with your special ability!
Kill 50 enemies with your special ability!
Kill 100 enemies with your special ability!
Kill 250 enemies with your special ability!
Try to kill 10 Zombies
Try to kill 20 Zombies
Try to kill 50 Zombies