Here is the full list of all 24 YamaYama achievements.
Get 200 Points.
Get the jello right before it disappears in Defend The Jello.
Win at sudden death.
Get 5 double kills.
Destroy two players at once in Firecracker.
FatSuit another player through the teleportation tunnel.
Collect 20 power up packages.
Win a match.
Collect all the power up packages in one gamemode.
FatSuit enemy players 50 times.
Humiliate your opponents in a single gamemode.
Steal more than 10 jellos from a specific opponent in Jello in my Belly.
FatSuit 100 times.
Get 5 after death kills.
Play through all the gamemodes at least once.
Winning 50 single gamemodes.
Winning a gamemode after losing at least three in a row.
Win 10 matches.
Win over 80% of the gamemodes in a full game.
Win all the gamemodes in a full game.
Survive until the round timer ends in Snake 6110.
Electrocute opponents 10 times in one round in Prom Queen.
Collect 15 points without dropping the Platypus/Flamingo.
Be the only one to Catch The Pig 3 times in a row.