Easy "Saved heart" Achievement
Do the "story" missions until the Witch says you need to defeat a giant ice slime. (Hint for the Groh egg quest: Find the gargoyle birds and wait until nighttime. They will be sleeping and you can go in for eggs. These eggs also give fifteen hunger so they are useful often.) When you get to this point, just track it down. There will be giant disturbed areas, kind of like a crater-looking spot but only level, and when you approach or interact with one it will say where the slime was headed (north, south, east, or west). You are getting close when your character says "It must be nearby", or something like that. You then need to attack it until it dies, while dealing with its ground pound-like ability and its lackies that join in from its body(?). When you defeat it, you will see an ice heart fall. Pick it up and BOOM! Achievement!