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