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