I won't be covering the level achievements as they're self-explanatory.

Freedom!

On the final level (level 100), simply escape the box in which you're contained.

https://gtm.steamproxy.vip/sharedfiles/filedetails/?id=2311617429

Easter Egg!

Load up level 75 and find the hidden easter egg (as shown below), or lack of should I say.

https://gtm.steamproxy.vip/sharedfiles/filedetails/?id=2311617475

Up For a Challenge!

On the level selection screen, simply enter the secret (partial) Konami Code using your keyboard arrow keys. That being: