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