UPDATE: 3-15-18: This currently works in non-ranked matches as well, specifically the 1v1 playlist as seen in the comments. Playlist changes and updates have occurred and possibly help here!
NOTE: Thanks to 'Master Jason', you unfortunately must play ranked matches for this achievement.
Fortunately, Blitz matches don't take very long, unless you get addicted like me and try to win every game!
The blitz play modes available have fluctuated since the game launched, so there might not be a 1v1 mode, just pick whichever you prefer.
If you don't care about winning, just search for any mode, preferably 1v1 Blitz, and then just don't leave your home base. The enemy should win in less than 3 minutes easily.
Just in case you want to try to win every game, I found this Atriox deck simply devastatingly effective--I had something like a 10 win streak a couple nights ago with it!
Start with two Banshees and a Marauder, and the deck something like this:
Atroix's healing power
I have to update this once I load up the game again, I wrote these from memory and forgot the exact spellings.
The Banshee/Marauder combination mashes almost any starting enemy combo, and if you can get the engineer in early or another banshee it's really fun!