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