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