Here is the full list of all 14 Inventioneers achievements.
Grabbed all the stars.
Completed all levels in all the chapters.
Completed your first chapter.
Completed chapter 1.
Completed chapter 2.
Completed chapter 3.
Completed chapter 4.
Completed chapter 5.
Completed chapter 6.
Completed chapter 7.
Completed chapter 8.
Created a level.
Completed a level created by a friend.
Created 10 levels.