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