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