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