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