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.
Kill 20 enemy players in multiplayer using a turret.
Win a ranked match in every multiplayer mode.
Reach level 60 in multiplayer.
Buy every upgrade and character in multiplayer.
Kill 10 multiplayer enemies using your melee attack.
Kill 2 multiplayer enemies with a single explosive.
Reach level 10 in multiplayer.
Catch a player in a snare trap in multiplayer.
Rope pull 5 enemies off edges.
Complete a match in all multiplayer modes.
In multiplayer, escape death 3 times by using the rope ascender.
Survive 10 explosions in multiplayer.
Revive a teammate in a multiplayer match.
Incapacitate 25 enemies with dodge counter.
Fully mod and completely upgrade all weapons.
Complete all conversations with the Endurance crew.
Kill a zip-lining enemy player in multiplayer.
In multiplayer, be the only player on your team that isn't dead or downed.
Purchase a new multiplayer character.
Find all documents, relics and GPS caches.
Complete all challenges.
Kill FeeFee the crab.
Purchase all skills in all categories.
Complete the game.
Kill 40 enemies with the shotgun.
Force an enemy to drop dynamite that kills two people when exploding.
Fully mod and completely upgrade any weapon.
Kill and loot 10 flying animals (crows and gulls).
Complete all optional tombs.
Find 75% of all documents.
Collect 75% of all relics.
Find 75% of GPS caches.
Kill and loot 10 large animals (deer, boar, wolves).
Shoot 10 enemies off zip lines.
Shoot a bundle of dynamite out of the air.
Loot 200 enemies.
Kill 75 enemies with the rifle.
Kill 25 unaware enemies.
Purchase all skills in one category.
Perform 15 finishers.
Collect 5000 pieces of salvage.
Perform 50 headshot kills in the single player campaign.
Kill and loot 10 small animals (rabbits, chickens, rats).
Kill 35 enemies with the pistol.
Collect 25% of all relics.
Find 25% of GPS caches.
Find 25% of all documents.
Kill 50 enemies with the bow.
Complete one challenge.
Complete one optional tomb.