Here is the full list of all 30 Platfinity achievements.
Export Your Game to a Stand-Alone .exe
Create a New, Empty Game
Play Through the Tutorial
Complete Proving Grounds
Finish Proving Grounds in Less Than 2:45
Finish Proving Grounds in Less Than 12 Deaths
Finish Proving Grounds in Less Than 7 Deaths
Complete Purgatory
Complete Purgatory, Again
Finish Purgatory in Less Than 2:00
Finish Purgatory in Less Than 5 Deaths
Finish Purgatory Without Dying
Complete 8 Bit Love Affair
Touch All the letters in 8 Bit Love Affair
Finish 8 Bit Love Affair Part One in Less Than 1:00
Finish 8 Bit Love Affair Part Two in Less Than 1:45
Finish 8 Bit Love Affair Part One in Less Than 5 Deaths
Finish 8 Bit Love Affair Part Two in Less Than 5 Deaths
Finish 8 Bit Love Affair Part One Without Dying
Finish 8 Bit Love Affair Part Two Without Dying
Complete Ghost in the City
Complete a Demo Game Without Dying (except Tutorial)
Finish a Game Without Idling (except Tutorial)
Play a Built-In Demo Game (except Tutorial)
Die Exactly 8 times But Finish the Game (except Tutorial)
Import a Graphic File From Your Computer
Watch All of the Credits
Read All of the Help Texts
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