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