Microsoft Minesweeper

An easy way to grind this achievement is to scout each level for doors, find the required amount of keys, then click each door as your character will automatically dig to where you click. One thing to note is blowing up doors with dynamite actually counts. With this in mind, a good habit is to clear out your "free" blocks in case there's any hiding in them. Once you've opened all the doors on the level, or if there weren't any to begin with, click the exit and your character will automatically dig to it.

Clear most of the free blocks in a level, and you'll end up with a few keys. These can be used to open doors. Doors are visible right from the start of a level. Click and hold and drag to search for them. Once you find your keys, head to the doors and open them. Simply opening them will count. There's no need to walk into their rooms. For example, if a door is hard to reach, you may blow up one of the room's walls with dynamite and take a quicker path to it. Like with Monster Hunter, it's recommended that you grind 10-15 level games. Sometimes, you'll find arrows in the corresponding areas. Use these to make progress towards the following achievement:



Also, as noted by Excalibur0126, blowing them up with dynamite counts.