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