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