A 15 mana crystal achievement not working

Rootbreaker

Origins Chapter 3 part 2, level 4

The description of the achievement is "Pacifism: Kill 12 or less enemy creatures during a single fight"

The grammar is wrong (should be 12 or fewer), but it also doesn't work. I killed one enemy creature, it said so on the stats screen after the battle, but it didn't give me the achievement.

Rootbreaker

In a similar note, the 15 mana crystal achievement on Level 7 of Chapter 3 part 2 is giving credit when it isn't due. I got the achievement for casting deathtouch creatures without having any in my deck (or any way to give my creatures deathtouch).

madsalad

This one had me scratching my head. How can I have lost 0 creatures for one goal, and 1 creature for the other goal?