Here is the full list of all 35 Fall Guys: Ultimate Knockout (2020) trophies - there are 21 bronze, 8 silver, 5 gold and 1 platinum.
Acquire all other trophies
Win 20 Episodes
Win an Episode with a custom Punchline equipped
Unlock 50 cosmetic items from the store
Qualify from 500 rounds
Equip a legendary Body Colour, Pattern, Upper and Lower Costume piece
Reach lvl 40 fame during a season
Win 7 Episodes
Get first place in a racing round 20 times
Unlock 10 cosmetic items from the store
Clock up 1 hour total time falling
Perform an emote just before coming first in a race round
Bump into other Fall Guys 1000 times in total
Reach lvl 25 fame during a season
Qualify from 100 rounds
Qualify from a racing round despite falling over more than 10 times
Knock someone over
Get first place in a racing round 5 times
Win an Episode as part of a party of 3 or more players
Fall for at least 3 seconds before landing on your head
Win your first Episode
Qualify from a team game with a score of 1
Get first place in a racing round
Reach lvl 10 fame during a season
Equip a rare or legendary Body Colour, Pattern, Upper and Lower Costume piece
Qualify after a round goes to overtime
Reach terminal velocity
Qualify from a round without falling over even once
Share a hug with a Fall Guy
Bump into 3 people while rolling on the ground before getting up
Qualify from your first round
Equip an uncommon or better Body Colour, Pattern, Upper and Lower Costume piece
Equip your first legendary customization item
Equip your first cosmetic item
Win 5 Episodes in a row