Here is the full list of all 17 Pahelika: Secret Legends achievements.
Complete Stage 1
Complete the tutorial
Solve a Stage within 5 minutes
Complete a Stage without using any hints
Complete entire game within an hour
Complete the game without using hints
Play the game with cheats enabled
Skip any minigame
Skip all minigames
Solve all the slider puzzles without skipping
Complete all the minigames, without skipping any one of them
Complete the Memory Minigame within 60 Seconds.
Complete the Pressure Balancing minigame in your first attempt
Complete Stage 4
Complete Stage 5
Complete the entire game
Complete the game twice