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