Here is the full list of all 31 Pummel Party achievements.
Survive for 50 seconds in 'Bullet Barrage'
Place last in every minigame
Place first in every minigame
Complete 'Gift Grab' without collecting coal
Score over 5 in 'Bouncing Balls'
Hit three players with the remote control eggplant
Knockout 10 players in one game of 'Explosive Exchange'
Complete 'Slippery Sprint' without falling in the water
Died in 'Acidic Atoll' throwing a barrel
Find the treasure in 'Sandy Search'
Get a double kill in 'Barn Brawl'
Survive in 'Breaking Blocks' for 60 seconds
Survive for at least 50 seconds in 'Sorcerers Sprint'
As the lightning holder kill every other player in 'Thunderous Trench'
Complete 'Rusty Racers' without falling off the track
Knock off 5 players in one game of 'Snowy Spin'
Win 'Magma & Mages' without taking damage
Steal the last gift in a players pile in 'Grifting Gifts'
Collect 40 keys in 'Winter Maze'
Take no damage in 'Searing Spotlights' minigame
Skewer three players with the rocket skewer item
Get a 5 player kill sreak in 'Speedy Sabers'
Control over 50% of the area in 'Elemental Escalation'
Start your first game
Got hit by the train in 'Temporal Trails'
Accidentally blew yourself up in the 'Strategic Shockwave' minigame
Get your first goal
Get launched off screen in 'Tunneling Tanks'
Win your first game
Win your first minigame