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 challenges.
Catch a player in a snare trap in multiplayer.
In multiplayer, be the only player on your team that isn't dead or downed.
Complete the game.
Find all documents, relics and GPS caches.
Incapacitate 25 enemies with dodge counter.
Complete all optional tombs.
Fully mod and completely upgrade all weapons.
Purchase all skills in all categories.
Kill 40 enemies with the shotgun.
Fully mod and completely upgrade any weapon.
Find 75% of all documents.
Find 75% of GPS caches.
Complete all conversations with the Endurance crew.
Collect 75% of all relics.
Kill FeeFee the crab.
Shoot 10 enemies off zip lines.
Purchase all skills in one category.
Kill 50 enemies with the bow.
Kill 75 enemies with the rifle.
Loot 200 enemies.
Kill 35 enemies with the pistol.
Kill 25 unaware enemies.
Collect 5000 pieces of salvage.
Shoot a bundle of dynamite out of the air.
Force an enemy to drop dynamite that kills two people when exploding.
Find 25% of GPS caches.
Rope pull 5 enemies off edges.
Perform 50 headshot kills in the single player campaign.
Perform 15 finishers.
Collect 25% of all relics.
Find 25% of all documents.
Complete one challenge.
Kill and loot 10 small animals (rabbits, chickens, rats).
Kill and loot 10 large animals (deer, boar, wolves).
Kill and loot 10 flying animals (crows and gulls).
Complete one optional tomb.
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.
Purchase a new multiplayer character.
Reach level 10 in multiplayer.
Buy every upgrade and character in multiplayer.
Reach level 60 in multiplayer.