I'm no expert on modding, but based on what little I've done with KB, your change looks okay to me. Did you make identical changes to the other entries for the medal? Each entry has to have the same values shown below for it to work.
max1=40
max2=100
max3=170
max4=280
max5=400
order=10
complex=1
param=0
var1=spells_used-spell_fire_arrow,spells_used-spell_shroud,spells_used-spell_fire_breath,spells_used-spell_fire_ball,spells_used-spell_fire_rain
var2=spells_used-spell_fire_arrow,spells_used-spell_shroud,spells_used-spell_fire_breath,spells_used-spell_fire_ball,spells_used-spell_fire_rain
var3=spells_used-spell_fire_arrow,spells_used-spell_shroud,spells_used-spell_fire_breath,spells_used-spell_fire_ball,spells_used-spell_fire_rain
var4=spells_used-spell_fire_arrow,spells_used-spell_shroud,spells_used-spell_fire_breath,spells_used-spell_fire_ball,spells_used-spell_fire_rain
var5=spells_used-spell_fire_arrow,spells_used-spell_shroud,spells_used-spell_fire_breath,spells_used-spell_fire_ball,spells_used-spell_fire_rain
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