Good guide, but I'd say there are definitely glitched achievements. One in particular is the red hat achievement, I can't get red hat no2 (Fast Dig) because the game has glitched.
Seems like the advice is wait till you've met the criteria for all of the red hats, then go round and buy them all in one go.
Originally Posted by TopBadge
What you people need to understand is that these guides are written by people not magic robots.