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