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