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.
Find all documents, relics and GPS caches.
Complete all challenges.
Incapacitate 25 enemies with dodge counter.
Fully mod and completely upgrade all weapons.
Complete all optional tombs.
Purchase all skills in all categories.
Complete the game.
Buy every upgrade and character in multiplayer.
Reach level 60 in multiplayer.
Purchase a new multiplayer character.
Survive 10 explosions in multiplayer.
Kill 20 enemy players in multiplayer using a turret.
Win a ranked match in every multiplayer mode.
Complete a match in all multiplayer modes.
Reach level 10 in multiplayer.
Kill 10 multiplayer enemies using your melee attack.
Kill a zip-lining enemy player in multiplayer.
Kill 2 multiplayer enemies with a single explosive.
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.
In multiplayer, escape death 3 times by using the rope ascender.
Complete all conversations with the Endurance crew.
Find 75% of all documents.
Shoot a bundle of dynamite out of the air.
Collect 75% of all relics.
Find 75% of GPS caches.
Fully mod and completely upgrade any weapon.
Kill 75 enemies with the rifle.
Kill FeeFee the crab.
Purchase all skills in one category.
Loot 200 enemies.
Shoot 10 enemies off zip lines.
Kill 25 unaware enemies.
Kill 40 enemies with the shotgun.
Collect 5000 pieces of salvage.
Force an enemy to drop dynamite that kills two people when exploding.
Kill 35 enemies with the pistol.
Rope pull 5 enemies off edges.
Find 25% of GPS caches.
Perform 50 headshot kills in the single player campaign.
Perform 15 finishers.
Kill 50 enemies with the bow.
Collect 25% of all relics.
Find 25% of all documents.
Kill and loot 10 flying animals (crows and gulls).
Complete one challenge.
Kill and loot 10 large animals (deer, boar, wolves).
Kill and loot 10 small animals (rabbits, chickens, rats).
Complete one optional tomb.