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