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