possible difficulty glitch?

[lordmerchant]

I got stranglehold a week or so ago, and played on normal up until the stage where you gotta protect the band. After many attempts I decided to switch down to easy just to get past this part, today I continued playing, never changing the difficulty back to normal, and when I completed the final boss I got the completed game on easy achievement even though I completed 23 chapters on casual mode. So it seems you dont have to complete every level on normal to get the completed game on normal mode achievement, can anybody confirm this?

[Teh lolNinja]

The difficulty achievements in Stranglehold are 'stackable', so your experience isn't a glitch as by completing the stages on Normal, they count as completed on Casual too, for achievement purposes.

[Blkmag1k]

yep, complete the game on hard-boiled you also get hard, normal and casual. take out 4 birds with 1 stone

[The Pants Party]

This is mentioned in the FAQ thread.