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