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.
Buy every upgrade and character in multiplayer.
Reach level 60 in multiplayer.
Complete all challenges.
Fully mod and completely upgrade all weapons.
Find all documents, relics and GPS caches.
Find 75% of GPS caches.
Purchase all skills in all categories.
Complete all optional tombs.
Collect 75% of all relics.
Complete the game.
Fully mod and completely upgrade any weapon.
Find 75% of all documents.
Complete all conversations with the Endurance crew.
Loot 200 enemies.
Incapacitate 25 enemies with dodge counter.
Rope pull 5 enemies off edges.
Purchase all skills in one category.
Kill and loot 10 flying animals (crows and gulls).
Kill FeeFee the crab.
Kill 40 enemies with the shotgun.
Shoot 10 enemies off zip lines.
Collect 5000 pieces of salvage.
Find 25% of GPS caches.
Kill 75 enemies with the rifle.
Shoot a bundle of dynamite out of the air.
Force an enemy to drop dynamite that kills two people when exploding.
Kill 25 unaware enemies.
Kill 35 enemies with the pistol.
Kill and loot 10 small animals (rabbits, chickens, rats).
Collect 25% of all relics.
Kill 50 enemies with the bow.
Perform 50 headshot kills in the single player campaign.
Perform 15 finishers.
Find 25% of all documents.
Complete one challenge.
Complete one optional tomb.
Kill and loot 10 large animals (deer, boar, wolves).
Win a ranked match in every multiplayer mode.
Complete a match in all multiplayer modes.
Kill 20 enemy players in multiplayer using a turret.
Revive a teammate in a multiplayer match.
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.
Kill a zip-lining enemy player in multiplayer.
Kill 2 multiplayer enemies with a single explosive.
Kill 10 multiplayer enemies using your melee attack.
Reach level 10 in multiplayer.
Purchase a new multiplayer character.
Survive 10 explosions in multiplayer.
Catch a player in a snare trap in multiplayer.