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