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