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