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