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