Here is the full list of all 31 Pummel Party achievements.
Got hit by the train in 'Temporal Trails'
Survive in 'Breaking Blocks' for 60 seconds
Get a 5 player kill sreak in 'Speedy Sabers'
Get launched off screen in 'Tunneling Tanks'
Win your first game
Get a double kill in 'Barn Brawl'
Score over 5 in 'Bouncing Balls'
Steal the last gift in a players pile in 'Grifting Gifts'
Collect 40 keys in 'Winter Maze'
Get your first goal
Win your first minigame
Complete 'Rusty Racers' without falling off the track
Accidentally blew yourself up in the 'Strategic Shockwave' minigame
Start your first game
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'
As the lightning holder kill every other player in 'Thunderous Trench'
Knockout 10 players in one game of 'Explosive Exchange'
Survive for at least 50 seconds in 'Sorcerers Sprint'
Knock off 5 players in one game of 'Snowy Spin'
Find the treasure in 'Sandy Search'
Died in 'Acidic Atoll' throwing a barrel
Win 'Magma & Mages' without taking damage
Complete 'Slippery Sprint' without falling in the water
Complete 'Gift Grab' without collecting coal