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