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.
Kill a zip-lining enemy player in multiplayer.
Kill 2 multiplayer enemies with a single explosive.
Win a ranked match in every multiplayer mode.
Complete a match in all multiplayer modes.
Revive a teammate in a multiplayer match.
Catch a player in a snare trap in multiplayer.
Kill 20 enemy players in multiplayer using a turret.
Kill 10 multiplayer enemies using your melee attack.
Buy every upgrade and character in multiplayer.
Reach level 60 in multiplayer.
In multiplayer, be the only player on your team that isn't dead or downed.
Complete all challenges.
Find all documents, relics and GPS caches.
Fully mod and completely upgrade all weapons.
Complete all optional tombs.
Purchase all skills in all categories.
Find 75% of GPS caches.
Kill FeeFee the crab.
Kill and loot 10 flying animals (crows and gulls).
Collect 75% of all relics.
Complete one challenge.
Find 75% of all documents.
Find 25% of GPS caches.
Complete the game.
Fully mod and completely upgrade any weapon.
Complete all conversations with the Endurance crew.
Incapacitate 25 enemies with dodge counter.
Purchase all skills in one category.
Loot 200 enemies.
Rope pull 5 enemies off edges.
Kill 40 enemies with the shotgun.
Kill 75 enemies with the rifle.
Collect 5000 pieces of salvage.
Collect 25% of all relics.
Kill 25 unaware enemies.
Kill 50 enemies with the bow.
Shoot 10 enemies off zip lines.
Kill and loot 10 large animals (deer, boar, wolves).
Kill and loot 10 small animals (rabbits, chickens, rats).
Force an enemy to drop dynamite that kills two people when exploding.
Shoot a bundle of dynamite out of the air.
Perform 15 finishers.
Perform 50 headshot kills in the single player campaign.
Kill 35 enemies with the pistol.
Find 25% of all documents.
Complete one optional tomb.
Survive 10 explosions in multiplayer.
In multiplayer, escape death 3 times by using the rope ascender.
Reach level 10 in multiplayer.
Purchase a new multiplayer character.