Acid Reflux Acievement Glitch

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So I beat chapter 5 of Spewer and was surprized when the achievement for it did not trigger. I tried beating the last level again, and beating the bonus level that comes after it, but I stilldo not have the achievement. Does anyone know how to fix this?

[james.adams]

Same problem here - just finished chapter 5 and no achievement, Currently working through the bonus levels.

Update: Aha! Try playing the endgame level ("Culmination" - not "The Crux") and watching the ending again. That just did it for me.

[JSC]

Wow, I swear I replayed that section twice and nothing happened. It worked this time though, so I'm just happy I don't have to do something rediculous to unlock it. Thank you very much.