Is there a new mini-game in HOTS?
After quickly glancing at the achievements before heading to work this morning, I didn't find any achievements that would indicate that a new mini-game has been introduced in Heart of the Swarm.
I'm wondering if there is indeed a new mini-game. In Wings of Liberty there was the "The Lost Viking" arcade cabinet, which would let you play that little top down shooter which was quite enjoyable.
If possible, don't include spoilers in your answer, as I've yet to indulge in the single player campaign just yet.
Having completed the campaign and like you gone through the achievements I will say there is no mini-game in Heart of the Swarm campaign like "the Lost Viking" in Wings of Liberty.
There aren't any minigames in HotS similar to SC2: WoL, but there are Zerg evolution "mini" missions between missions. Completing all of them gives you an achievement.