Puzzle Quest 3

Unfortunately this achievement is once again not retroactive, so even with the 10 Adventures that we did for the Season 3.0 achievement update, we're starting at zero once again. I did find out (after completing Going on an Adventure (15G) over a 10-week span) that there are some adventures that can be repeated. Be on the lookout for these, and you can knock out a huge chunk of this or even all 50 during a single adventure period. You'll likely need to spend a lot of gems to keep refreshing your energy though, or just work on it slowly over time.