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