Here is the full list of all 27 Blue Estate The Game achievements. It takes around 8-10 hours to unlock all of the achievements on Windows.
Arcade: Perfom 500 headshots in Slomo.
Story: Get a 4 Star global ranking at the end of all levels.
Story: Complete the last level in Crazytrain difficulty.
Story: Find and shoot all the hidden objects in the game.
Story: Perform 200 nutshots.
Story: Kill the screaming enemy on all levels.
Story: Kill 20 enemies with a chihuahua on your leg.
Story: Perform 3,000 headshots.
Story: Kill Kim Bong Sik, without getting hit by his projectiles.
Arcade: Beat a fast-forward time of 1 min 05 sec in level 6, on Normal.
Arcade: Beat the 2,100,000 point score at the end of level 2, on Crazytrain.
Arcade: Kill 25 enemies in one game while in Slomo in level 5, on Abnormal.
Arcade: Get the golden AK-47 once in all levels, on Abnormal.
Arcade: Get an S ranking at the end of level 6, on any difficulty setting.
Arcade: Get the "All enemies killed" bonus at the end of each level, on any difficulty setting.
Arcade: Get an S ranking at the end of level 7, on any difficulty setting.
Arcade: Get an S ranking at the end of level 5, on any difficulty setting.
Arcade: Get an S ranking at the end of level 4, on any difficulty setting.
Arcade: Get an S ranking at the end of level 3, on any difficulty setting.
Arcade: Accumulate 10 minutes of fast-forward.
Arcade: Get an S ranking at the end of level 2, on any difficulty setting.
Arcade: Get an S ranking at the end of level 1, on any difficulty setting.
Story: Complete the last level.
Story: Kill Bloodshot avoiding all his melee attacks and slapping his face everytime you can.
Story: Kill Teniu the Grave, dodging all the crates.
Story: Complete level 4.
Story: Complete the first level.