Frequent Flyer Miles may be easy, but it's the only achievement I have left to get. The hardest was Bourgeoisie until I read Kriegheld's comment. Quoted for truthery:
"To get the "Bourgeoisie" achievement, reset your upgrades and then repurchase all the upgrades except for Homing Beacon (now you can be more precise), Rabbit's Foot (less gray geese), Rain Dance (no more being bombarded by geese during a storm), and Poseidon's Blessing/Phoenix Pendant (allows you to die quicker to reset)."
The idea of powering up your letters is good but it takes sooooo long. I'm up to level 11 and I have a single special level 1. For people who like grinding only.
Fun game, but a small bug. When you try trading the slingshot in, weird things happen.
After talking to the guy in the hills I wanted to trade in the slingshot to recover the purple rose I had previously traded in. Instead it traded the application form. However, once I gave the rose to the guy I found I had a signed application form.
There's a serious impedance mismatch between the graphics and the physics which means you can never be sure whether you're about to fall through or not. Ugh.
 "Maze game 2- NO cheating!!"){kind=icon}
 "Endless Migration"){kind=icon}
 "Clockwords: Prelude"){kind=icon}
 "Tangarm 2"){kind=icon}
 "Air Something"){kind=icon}
 "Zombie Infestation: Strain 116"){kind=icon}
 "Seed of Destruction"){kind=icon}
 "Sage"){kind=icon}
 "Turtle Odyssey"){kind=icon}
 "Avo-De"){kind=icon}
 "Turbo Tanks 2"){kind=icon}
 "Canabalt"){kind=icon}
 "Vox Populi, Vox Dei(a werewolf thriller)"){kind=icon}
 "Warfare 1944"){kind=icon}
 "Another Small Favor"){kind=icon}
 "Run"){kind=icon}
 "Climb It Right"){kind=icon}
 "European Cities"){kind=icon}
 "Detix"){kind=icon}