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