Here is the full list of all 50 THE FINALS achievements.
Play 10 rounds with a Medium Build
Play 10 rounds with a Light Build
Play 10 rounds in a Party
Finish in first place, 3 times in a row
Obtain a total of 100,000 cash
Revive a teammate
Create a contestant
Insert a cash box into a cashout station
Play 3 rounds of Quick Cash
Play 10 rounds with a Heavy Build
Play 3 Tournament rounds
Complete the Tutorial
Revive teammates 50 times
Deal 1,000,000 damage to arenas
Get 300 eliminations with Ranged Weapons
Get 150 eliminations with Melee Weapons
Get 150 eliminations with Gadgets
Block a total of 25,000 damage
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
Throw a cash box into a cashout station from 20 meters away
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