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.
Complete the game.
Purchase all skills in all categories.
Incapacitate 25 enemies with dodge counter.
Fully mod and completely upgrade all weapons.
Complete all challenges.
Complete all optional tombs.
Complete all conversations with the Endurance crew.
Find 75% of all documents.
Fully mod and completely upgrade any weapon.
Collect 75% of all relics.
Find 75% of GPS caches.
Kill FeeFee the crab.
Kill 40 enemies with the shotgun.
Kill and loot 10 flying animals (crows and gulls).
Loot 200 enemies.
Kill 75 enemies with the rifle.
Kill 25 unaware enemies.
Shoot 10 enemies off zip lines.
Rope pull 5 enemies off edges.
Purchase all skills in one category.
Force an enemy to drop dynamite that kills two people when exploding.
Shoot a bundle of dynamite out of the air.
Collect 5000 pieces of salvage.
Kill 35 enemies with the pistol.
Perform 15 finishers.
Find 25% of GPS caches.
Perform 50 headshot kills in the single player campaign.
Kill 50 enemies with the bow.
Collect 25% of all relics.
Find 25% of all documents.
Kill and loot 10 small animals (rabbits, chickens, rats).
Complete one optional tomb.
Complete one challenge.
Kill and loot 10 large animals (deer, boar, wolves).
Buy every upgrade and character in multiplayer.
Reach level 60 in multiplayer.
Survive 10 explosions in multiplayer.
In multiplayer, escape death 3 times by using the rope ascender.
Win a ranked match in every multiplayer mode.
Complete a match in all multiplayer modes.
Purchase a new multiplayer character.
Reach level 10 in multiplayer.
Kill 2 multiplayer enemies with a single explosive.
Revive a teammate in a multiplayer match.
In multiplayer, be the only player on your team that isn't dead or downed.
Kill 20 enemy players in multiplayer using a turret.
Kill 10 multiplayer enemies using your melee attack.
Kill a zip-lining enemy player in multiplayer.
Catch a player in a snare trap in multiplayer.