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