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