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