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