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