Here is the full list of all 49 Animalistic achievements.
Beat a level without taking any damage.
Beat a level only using fists.
Beat the game.
Defeat Animalistic's final boss
Complete a level in one minute.
Punch through 100 doors.
Kill Thor the Boar.
Complete 15 levels
Complete 10 levels.
Kill one of each animal species.
Get shot 20 times in a level and beat it.
Receive every death message.
Kill Carl the Croc.
Kill an enemy with every gun.
Destroy 5 collectables.
Kill 2 enemies with one shotgun blast.
Complete 5 levels.
Kill an enemy with your slide.
Use a bomber to kill another animal.
Kill 10 enemies with one assault rifle.
Die 10 times in one level.
Kill 100 animals.
Kill a shield enemy with only your fists.
Kill 6 enemies at once while Animalistic.
Die for the first time.
Go Animalistic!
Find the first anonymous note
Punch an exploding barrel into an enemy.
Kill an enemy by throwing your gun at them.
Destroy all collectables.
Kill 5 enemies with one exploding barrel.
Beat a level without killing an enemy.
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.
Spend 30 minutes in one level.
Kill 1,000 animals.
Kill 50 flying animals.
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