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