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