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