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