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