Here is the full list of all 50 THE FINALS achievements.
Revive teammates 50 times
Play 10 rounds with a Medium Build
Block a total of 25,000 damage
Deal 1,000,000 damage to arenas
Play 10 rounds in a Party
Throw a cash box into a cashout station from 20 meters away
Obtain a total of 100,000 cash
Create a contestant
Finish in first place, 3 times in a row
Play 3 rounds of Quick Cash
Insert a cash box into a cashout station
Revive a teammate
Complete the Tutorial
Play 10 rounds with a Light Build
Play 10 rounds with a Heavy Build
Play 3 Tournament rounds
Get 300 eliminations with Ranged Weapons
Get 150 eliminations with Melee Weapons
Get 150 eliminations with Gadgets
Heal teammates for a total of 25,000 health
Win 150 rounds with a Light Build
Win 150 rounds with a Medium Build
Win 150 rounds with a Heavy Build
Obtain a total of 50,000,000 cash
Win the final round in Tournament or Ranked Tournament
Eliminate an opponent while they are carrying a cash box, 5 times
Eliminate an opponent trying to steal your cashout, 10 times
Start a cashout with less than 10 seconds remaining in the match
Steal a cashout with less than 10 seconds remaining in the match
Eliminate an opponent while you are riding a Zipline, 10 times
Eliminate an opponent while you are on fire, 5 times in a single round
Win a round in any mode without being eliminated
Eliminate an opponent by bouncing a grenade on a Jump Pad
Hit an opponent in the head with an explosive carriable
Hit opponents with 3 different carriables within 15 seconds
Eliminate an opponent with a headshot while you are sliding
Eliminate 3 opponents with 3 different items or carriables within 10 seconds
Eliminate 3 opponents with a Melee Weapon within 10 seconds
Eliminate 25 opponents with fire
Eliminate 25 opponents with gas
Get a headshot elimination with the last bullet in the magazine of your primary weapon
Eliminate an opponent with a flowerpot
Eliminate an opponent with a cash box
Use an emote after eliminating an opponent
Get eliminated by your own grenade
Destroy the skybridge in Seoul
Eliminate an opponent while you are emoting
Bounce a meteor off a Jump Pad during the Meteor Showers event
Start a cashout within 15 seconds after opening a vault
Place an Explosive Mine on a carriable and get an elimination by throwing it at an opponent