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