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.
Find all documents, relics and GPS caches.
Kill 40 enemies with the shotgun.
Kill 35 enemies with the pistol.
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.
Kill 20 enemy players in multiplayer using a turret.
Kill a zip-lining enemy player 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.
Kill 2 multiplayer enemies with a single explosive.
Complete a match in all multiplayer modes.
Survive 10 explosions in multiplayer.
Kill 10 multiplayer enemies using your melee attack.
Reach level 10 in multiplayer.
Revive a teammate in a multiplayer match.
Catch a player in a snare trap in multiplayer.
Fully mod and completely upgrade all weapons.
Purchase all skills in all categories.
Complete all optional tombs.
Complete one challenge.
Find 75% of GPS caches.
Complete the game.
Find 75% of all documents.
Collect 75% of all relics.
Fully mod and completely upgrade any weapon.
Perform 50 headshot kills in the single player campaign.
Kill 25 unaware enemies.
Purchase all skills in one category.
Kill and loot 10 flying animals (crows and gulls).
Kill FeeFee the crab.
Kill 75 enemies with the rifle.
Loot 200 enemies.
Shoot a bundle of dynamite out of the air.
Collect 5000 pieces of salvage.
Collect 25% of all relics.
Find 25% of GPS caches.
Kill 50 enemies with the bow.
Perform 15 finishers.
Find 25% of all documents.
Kill and loot 10 small animals (rabbits, chickens, rats).
Complete one optional tomb.
Kill and loot 10 large animals (deer, boar, wolves).
In multiplayer, be the only player on your team that isn't dead or downed.