Here is the full list of all 25 Covid Carl achievements.
5 Player Deaths
10 Player Deaths
100 Player Deaths
1000 Robo Soldier Kills
500 Mech Kills
100 Covid Carl Kills
250 Turret Kills
10000 Zombie Kills
Complete the Game
Complete the game 20 times
Find the Hidden Garage
Play Zoombies
Fire 500000 bullets.
Use 10000 seconds of flamethrower
Jump way too many times.
Fall to your death 500 times.
Take 50000 damage
Score 1000000 total points.
Score 5000000 total points.
Score 10000000 total points
Kill 10000 mutated animals.
Offend the Cat Knight's Honor
Played Covid Carl during the ScreamFest Event
Found the Good Dog
Collected all of the player skins.