Here is the full list of all 16 ENCODYA achievements.
Complete Part 1
Get a Fly Bus Ticket
Uncover the Octopi plan
Complete Part 2
Find a vantage point to see the landscape
Complete Part 3
Listen to the mysterious echo
Complete Part 4
Finish the game
Discover 3 Secrets
Discover 5 Secrets
Discover 7 Secrets
Discover 10 Secrets
Finish the game with less than 5 hints
Finish the game without hints
Finish the game in less than 3.5 hours