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