For A "Party Wipe" All Four Heroes Must Die In The Boss Battle.
- This Can Be Combined WIth The Achievement "First Party Wipe" If You Haven't Done It Yet.
To Spawn A Boss, You Must Do Dungeons In An Area Until The Progress Bar Above That Dungeon Fills Up Completely.
This Will Spawn A New Type Of Quest, The "Boss" Quest.
Picking This Quest In The Selected Region Will Put You In A Dungeon With The Boss.
You Still Have To Fight Your Way To Him!
Once You Finally Get Into Battle, Just Skip Turns Until You Die, And The Achievement Is Yours.
You May Get This One Organically If You Dont Know About The Retreat Button (Top Left On The Screen In-Game)
Good Luck!