Here is the full list of all 35 Fall Guys: Ultimate Knockout (EU) trophies - there are 21 bronze, 8 silver, 5 gold and 1 platinum.
Acquire all other trophies
Get first place in a racing round 20 times
Bump into 3 people while rolling on the ground before getting up
Reach terminal velocity
Perform an emote just before coming first in a race round
Fall for at least 3 seconds before landing on your head
Knock someone over
Unlock 10 cosmetic items from the store
Equip an uncommon or better Body Colour, Pattern, Upper and Lower Costume piece
Reach lvl 40 fame during a season
Equip a rare or legendary Body Colour, Pattern, Upper and Lower Costume piece
Win an Episode with a custom Punchline equipped
Equip a legendary Body Colour, Pattern, Upper and Lower Costume piece
Reach lvl 10 fame during a season
Qualify from 500 rounds
Reach lvl 25 fame during a season
Qualify from 100 rounds
Bump into other Fall Guys 1000 times in total
Unlock 50 cosmetic items from the store
Qualify after a round goes to overtime
Win an Episode as part of a party of 3 or more players
Equip your first cosmetic item
Win 5 Episodes in a row
Qualify from a round without falling over even once
Win your first Episode
Clock up 1 hour total time falling
Qualify from a team game with a score of 1
Qualify from a racing round despite falling over more than 10 times
Get first place in a racing round
Share a hug with a Fall Guy
Equip your first legendary customization item
Win 7 Episodes
Qualify from your first round
Get first place in a racing round 5 times
Win 20 Episodes