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