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