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