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