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