Here is the full list of all 34 Fall Guys achievements. It takes around 50-60 hours to unlock all of the achievements on Windows.
Win 5 Episodes in a row
Unlock 50 cosmetic items from the store
Win 20 Episodes
Reach lvl 40 fame during a season
Get first place in a racing round 20 times
Qualify from 500 rounds
Qualify from a team game with a score of 1
Win 7 Episodes
Clock up 1 hour total time falling
Win an Episode with a custom Celebration equipped
Perform an emote just before coming first in a race round
Get first place in a racing round 5 times
Equip a legendary Body Colour, Pattern, Upper and Lower Costume piece
Reach lvl 25 fame during a season
Win an Episode as part of a party of 3 or more players
Unlock 10 cosmetic items from the store
Win your first Episode
Qualify from 100 rounds
Equip a rare or legendary Body Colour, Pattern, Upper and Lower Costume piece
Equip an uncommon or better Body Colour, Pattern, Upper and Lower Costume piece
Equip your first legendary customization item
Reach lvl 10 fame during a season
Fall for at least 3 seconds before landing on your head
Get first place in a racing round
Bump into other Fall Guys 1000 times in total
Qualify from a round without falling over even once
Bump into 3 people while rolling on the ground before getting up
Qualify after a round goes to overtime
Share a hug with a Fall Guy
Qualify from your first round
Qualify from a racing round despite falling over more than 10 times
Reach terminal velocity
Knock someone over
Equip your first cosmetic item