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