Here is the full list of all 49 Animalistic achievements.
Kill an enemy with every gun.
Kill 10 enemies with one assault rifle.
Kill 6 enemies at once while Animalistic.
Punch through 100 doors.
Destroy 5 collectables.
Complete 5 levels.
Kill an enemy with your slide.
Kill 2 enemies with one shotgun blast.
Use a bomber to kill another animal.
Get shot 20 times in a level and beat it.
Die 10 times in one level.
Kill 100 animals.
Kill a shield enemy with only your fists.
Go Animalistic!
Die for the first time.
Kill an enemy by throwing your gun at them.
Complete 10 levels.
Beat the game.
Kill one of each animal species.
Punch an exploding barrel into an enemy.
Destroy all collectables.
Kill 5 enemies with one exploding barrel.
Complete a level in one minute.
Beat a level without killing an enemy.
Beat a level without taking any damage.
Beat a level only using fists.
Beat a level using every type of gun in the game.
Complete a level with less than 10% of your health remaining.
Complete all levels without dying.
Beat all levels using only your fists.
Beat the game in under 45 minutes.
Receive every death message.
Spend 30 minutes in one level.
Kill 1,000 animals.
Kill Carl the Croc.
Kill Thor the Boar.
Kill 50 flying animals.
Complete 15 levels
Defeat Animalistic's final boss
Find the first anonymous note
Solve one flying bat puzzle
Read 5 notes
Listen to 5 audio logs
Collect the Walkie Talkie
Collect the Biosample Gun
Collect the Vial
Begin the process of constructing the vaccine
Solve one password puzzle
Solve one torch puzzle