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 challenges.
Kill FeeFee the crab.
Force an enemy to drop dynamite that kills two people when exploding.
Reach level 10 in multiplayer.
Complete a match in all multiplayer modes.
Purchase a new multiplayer character.
Find all documents, relics and GPS caches.
Rope pull 5 enemies off edges.
Shoot 10 enemies off zip lines.
Shoot a bundle of dynamite out of the air.
Kill and loot 10 flying animals (crows and gulls).
Incapacitate 25 enemies with dodge counter.
Find 75% of GPS caches.
Collect 75% of all relics.
Complete the game.
Find 75% of all documents.
Complete all optional tombs.
Kill 40 enemies with the shotgun.
Kill 25 unaware enemies.
Loot 200 enemies.
Purchase all skills in all categories.
Fully mod and completely upgrade all weapons.
Find 25% of GPS caches.
Collect 5000 pieces of salvage.
Perform 15 finishers.
Collect 25% of all relics.
Complete one challenge.
Kill 75 enemies with the rifle.
Perform 50 headshot kills in the single player campaign.
Fully mod and completely upgrade any weapon.
Purchase all skills in one category.
Kill and loot 10 small animals (rabbits, chickens, rats).
Kill and loot 10 large animals (deer, boar, wolves).
Kill 35 enemies with the pistol.
Kill 50 enemies with the bow.
Find 25% of all documents.
Complete one optional tomb.
Complete all conversations with the Endurance crew.
Kill 20 enemy players in multiplayer using a turret.
Kill a zip-lining enemy player in multiplayer.
Catch a player in a snare trap in multiplayer.
Survive 10 explosions in multiplayer.
Revive a teammate in a multiplayer match.
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.
Kill 2 multiplayer enemies with a single explosive.
In multiplayer, escape death 3 times by using the rope ascender.
Buy every upgrade and character in multiplayer.
Reach level 60 in multiplayer.