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