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