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