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