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