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