The Old Guardian Pack Add-on for 100% Orange Juice has 7 achievements.
Play 10 games as Suguri (46 Billion Years) (DLC)
...you can dish out a great deal of punishment. (DLC)
I used to have so much energy, huh... (DLC)
Play 10 games as Sumika (DLC)
It's not a bug! Sumika just found a loophole! (DLC)
Sumika won't lose to her brother! (DLC)
Complete the Old Guardians campaign (DLC)