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