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