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