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.
Incapacitate 25 enemies with dodge counter.
Fully mod and completely upgrade all weapons.
Complete the game.
Find all documents, relics and GPS caches.
Purchase all skills in all categories.
Fully mod and completely upgrade any weapon.
Complete all challenges.
Kill FeeFee the crab.
Complete all optional tombs.
Find 75% of all documents.
Find 75% of GPS caches.
Collect 75% of all relics.
Kill 40 enemies with the shotgun.
Kill and loot 10 flying animals (crows and gulls).
Loot 200 enemies.
Kill and loot 10 large animals (deer, boar, wolves).
Kill 75 enemies with the rifle.
Purchase all skills in one category.
Kill 25 unaware enemies.
Perform 15 finishers.
Complete one challenge.
Collect 5000 pieces of salvage.
Shoot 10 enemies off zip lines.
Find 25% of GPS caches.
Force an enemy to drop dynamite that kills two people when exploding.
Shoot a bundle of dynamite out of the air.
Collect 25% of all relics.
Kill 35 enemies with the pistol.
Kill 50 enemies with the bow.
Perform 50 headshot kills in the single player campaign.
Kill and loot 10 small animals (rabbits, chickens, rats).
Find 25% of all documents.
Complete one optional tomb.
Buy every upgrade and character in multiplayer.
Reach level 60 in multiplayer.
Win a ranked match in every multiplayer mode.
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.
Complete a match in all multiplayer modes.
Reach level 10 in multiplayer.
Survive 10 explosions in multiplayer.
In multiplayer, escape death 3 times by using the rope ascender.
Kill 20 enemy players in multiplayer using a turret.
Kill 10 multiplayer enemies using your melee attack.
Purchase a new multiplayer character.
Catch a player in a snare trap in multiplayer.
Kill a zip-lining enemy player in multiplayer.