Here is the full list of all 9 tiny & Tall: Gleipnir Episode One achievements.
A first step towards saving the world!
You finished the game without ever asking for the solution.
You finished the game without asking for clues.
No sheet gets past you.
You've spilled oil on the ground. There's nothing to be proud of.
You provided some unsolicited cheese to a hungry rodent.
Your interpersonal skills are the stuff of legends.
You finished the game either without using the snoop feature, or by using it a very reasonable amount of times.
He might have been an obnoxious self-help writer, but you respected his will nonetheless.