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