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