Here is the full list of all 36 ECHOPLEX achievements.
Completed level 4
Completed level 3
Completed level 2
Completed level 1
Completed level 5
Completed level 6
Completed level 7
Completed level 8
Completed level 9
Completed level 10
Completed level 11
Completed level 12
Completed level 13
Completed level 14
Completed level 15
Completed level 16
Completed level 17
Completed level 18
Completed level 19
Completed level 20
Completed level 21
Completed level 22
Completed level 23
Completed level 24
Completed level 25
Completed level 26
Completed level 27
Ran 3 levels without expiry or restart
Ran 5 levels without expiry or restart
Ran 9 levels without expiry or restart
Ran 15 levels without expiry or restart
Ran 27 levels without expiry or restart
Completed first time trial
Completed time trial in under 17 minutes
Discovered secret area
Completed the game