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