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