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