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