Here is the full list of all 35 Hybrid Animals achievements.
Reach level 15.
Chop someone's head off with a bladed weapon.
Headshot a player from over 30 feet with the guass shotgun
Reach level 10.
Win a game of Natural Selection.
Win a game of Bad Apple.
Breed two hybrids, resulting in a mutant made up of 4 animals.
Shrink a player with the shrink ray, and squash him.
Reach level 6.
Breed a creature with a speed greater than 30.
Blow yourself up with the firecracker perk, and take out two other players in the process.
Reach level 3.
Achieve a triple kill by crushing players as a giant.
Use a creature in Deathmatch that you designed in the editor.
Collect 230 coins on "Vertical Madness"
Complete the level "Unstable Earth" without dying.
Collect 130 coins on "Parkour in Hell"
Headshot a player who is camouflaged.
Kill a player who is pulling you into his black hole, before the black hole kills you.
Achieve a triple kill by running into players while inside a Death-Ball.
Kill 4 players within 4 seconds of each other.
Kill 5 players within 4 seconds of each other.
Breed a creature with a damage greater than 30.
Breed a creature with an Health attribute greater than 30.
Breed a creature with all attributes greater than 24.
Breed a creature with all attributes greater than 30.
Win a game using a creature whose attributes are all less than 6.
Survive for a minute after being shot by the polarizor and having your gravity reversed.
Kill all the non-infected by yourself, in Zombie Mode.
Complete all Challanges on Drunk Mode
Collect 60 coins on "Parkour in Hell" in Nightmare mode
Collect 60 coins on "Vertical Madness" in Nightmare mode
Complete "Unstable Earth" on Nightmare mode
Reach level 20.
Kill 3 players within 4 seconds of each other.