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