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