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.
Complete all conversations with the Endurance crew.
Buy every upgrade and character in multiplayer.
Reach level 60 in multiplayer.
Incapacitate 25 enemies with dodge counter.
Shoot 10 enemies off zip lines.
Rope pull 5 enemies off edges.
Shoot a bundle of dynamite out of the air.
Force an enemy to drop dynamite that kills two people when exploding.
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 2 multiplayer enemies with a single explosive.
Reach level 10 in multiplayer.
Purchase a new multiplayer character.
In multiplayer, escape death 3 times by using the rope ascender.
Survive 10 explosions in multiplayer.
Kill 20 enemy players in multiplayer using a turret.
Kill 10 multiplayer enemies using your melee attack.
Kill a zip-lining enemy player in multiplayer.
Catch a player in a snare trap in multiplayer.
Find all documents, relics and GPS caches.
Complete the game.
Kill 40 enemies with the shotgun.
Fully mod and completely upgrade all weapons.
Complete all challenges.
Purchase all skills in all categories.
Perform 15 finishers.
Kill 75 enemies with the rifle.
Fully mod and completely upgrade any weapon.
Complete all optional tombs.
Find 75% of all documents.
Collect 75% of all relics.
Find 75% of GPS caches.
Kill and loot 10 flying animals (crows and gulls).
Kill FeeFee the crab.
Complete one challenge.
Purchase all skills in one category.
Kill and loot 10 large animals (deer, boar, wolves).
Loot 200 enemies.
Collect 5000 pieces of salvage.
Kill 25 unaware enemies.
Find 25% of GPS caches.
Collect 25% of all relics.
Find 25% of all documents.
Kill 50 enemies with the bow.
Kill and loot 10 small animals (rabbits, chickens, rats).
Perform 50 headshot kills in the single player campaign.
Kill 35 enemies with the pistol.
Complete one optional tomb.