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