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