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