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.
Fully mod and completely upgrade all weapons.
Kill 75 enemies with the rifle.
Rope pull 5 enemies off edges.
Incapacitate 25 enemies with dodge counter.
Complete all challenges.
Shoot a bundle of dynamite out of the air.
Complete all conversations with the Endurance crew.
Kill 20 enemy players in multiplayer using a turret.
Kill a zip-lining enemy player in multiplayer.
Win a ranked match in every multiplayer mode.
In multiplayer, escape death 3 times by using the rope ascender.
Buy every upgrade and character in multiplayer.
Reach level 60 in multiplayer.
Revive a teammate in a multiplayer match.
Kill 10 multiplayer enemies using your melee attack.
Shoot 10 enemies off zip lines.
Kill 40 enemies with the shotgun.
Survive 10 explosions in multiplayer.
Purchase all skills in all categories.
Kill FeeFee the crab.
Find 75% of GPS caches.
Collect 75% of all relics.
Find 75% of all documents.
Find 25% of GPS caches.
Loot 200 enemies.
Fully mod and completely upgrade any weapon.
Kill and loot 10 small animals (rabbits, chickens, rats).
Kill and loot 10 flying animals (crows and gulls).
Complete all optional tombs.
Complete one challenge.
Complete the game.
Find 25% of all documents.
Collect 25% of all relics.
Collect 5000 pieces of salvage.
Purchase all skills in one category.
Kill and loot 10 large animals (deer, boar, wolves).
Perform 50 headshot kills in the single player campaign.
Kill 25 unaware enemies.
Reach level 10 in multiplayer.
Complete a match in all multiplayer modes.
Catch a player in a snare trap in multiplayer.
Purchase a new multiplayer character.
In multiplayer, be the only player on your team that isn't dead or downed.
Kill 2 multiplayer enemies with a single explosive.
Kill 50 enemies with the bow.
Kill 35 enemies with the pistol.
Force an enemy to drop dynamite that kills two people when exploding.
Perform 15 finishers.
Complete one optional tomb.