Here is the full list of all 18 LingerToAlive achievements.
EnterArmorRoom
EnterFirstAidKitRoom
EnterToolRoom
OpenTheGateUsingTheGateControllerInTheFirstMap
Complete a map with the highest difficulty
Choose the simplest difficulty in the custom mode and win
Choose the highest difficulty in the custom mode and win
Set the number of monsters greater than 100 and win in the custom mode
Complete the setting of skill points once
Full the points of speed skill
Full the points of HP skill
Full the points of Bag skill
Set the difficulty of custom mode to the simplest, set the maximum number of monsters to 1000, and win
Set the difficulty of custom mode to standard, set the maximum number of monsters to 1000, and win
Set the difficulty of custom mode to the most difficult, set the maximum number of monsters to 1000, and win
Into 2d survival game mode
Click the 'Load Save' button
Click the 'quit' button