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.
Reach level 10 in multiplayer.
Kill 10 multiplayer enemies using your melee attack.
In multiplayer, be the only player on your team that isn't dead or downed.
Revive a teammate in a multiplayer match.
Kill 2 multiplayer enemies with a single explosive.
Find 75% of all documents.
Complete all optional tombs.
Fully mod and completely upgrade any weapon.
Complete one challenge.
Complete the game.
Kill and loot 10 large animals (deer, boar, wolves).
Purchase all skills in one category.
Shoot a bundle of dynamite out of the air.
Loot 200 enemies.
Kill FeeFee the crab.
Find 25% of GPS caches.
Collect 5000 pieces of salvage.
Kill 35 enemies with the pistol.
Collect 25% of all relics.
Perform 15 finishers.
Kill 25 unaware enemies.
Find 25% of all documents.
Kill 50 enemies with the bow.
Perform 50 headshot kills in the single player campaign.
Kill and loot 10 small animals (rabbits, chickens, rats).
Complete one optional tomb.
Collect 75% of all relics.
Find 75% of GPS caches.
Find all documents, relics and GPS caches.
Purchase all skills in all categories.
Fully mod and completely upgrade all weapons.
Kill and loot 10 flying animals (crows and gulls).
Kill 75 enemies with the rifle.
Kill 40 enemies with the shotgun.
Force an enemy to drop dynamite that kills two people when exploding.
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.
Win a ranked match in every multiplayer mode.
In multiplayer, escape death 3 times by using the rope ascender.
Purchase a new multiplayer character.
Buy every upgrade and character in multiplayer.
Reach level 60 in multiplayer.