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