Here is the full list of all 50 Tomb Raider achievements. It takes around 40-50 hours to unlock all of the achievements on Windows.
Buy every upgrade and character in multiplayer.
Reach level 60 in multiplayer.
Purchase a new multiplayer character.
Win a ranked match in every multiplayer mode.
Complete a match in all multiplayer modes.
Survive 10 explosions in multiplayer.
Catch a player in a snare trap in multiplayer.
Kill 20 enemy players in multiplayer using a turret.
Reach level 10 in multiplayer.
Kill 10 multiplayer enemies using your melee attack.
Revive a teammate in a multiplayer match.
In multiplayer, be the only player on your team that isn't dead or downed.
Kill 2 multiplayer enemies with a single explosive.
Kill a zip-lining enemy player in multiplayer.
In multiplayer, escape death 3 times by using the rope ascender.
Complete all conversations with the Endurance crew.
Incapacitate 25 enemies with dodge counter.
Shoot a bundle of dynamite out of the air.
Kill 40 enemies with the shotgun.
Rope pull 5 enemies off edges.
Shoot 10 enemies off zip lines.
Kill 75 enemies with the rifle.
Find all documents, relics and GPS caches.
Complete the game.
Fully mod and completely upgrade all weapons.
Complete all challenges.
Fully mod and completely upgrade any weapon.
Purchase all skills in all categories.
Purchase all skills in one category.
Complete all optional tombs.
Find 75% of all documents.
Find 75% of GPS caches.
Collect 75% of all relics.
Kill FeeFee the crab.
Force an enemy to drop dynamite that kills two people when exploding.
Loot 200 enemies.
Kill 35 enemies with the pistol.
Perform 15 finishers.
Collect 5000 pieces of salvage.
Kill 25 unaware enemies.
Kill and loot 10 flying animals (crows and gulls).
Find 25% of GPS caches.
Collect 25% of all relics.
Perform 50 headshot kills in the single player campaign.
Kill 50 enemies with the bow.
Find 25% of all documents.
Complete one challenge.
Kill and loot 10 small animals (rabbits, chickens, rats).
Complete one optional tomb.
Kill and loot 10 large animals (deer, boar, wolves).