I know I need to make this section of code a function because I keep repeating it, but I can't think of an effective way to make it one.
on inventory click:
name of event-inventory is "&cᴋɪʟʟs"
cancel event
event-inventory is not player's inventory
{playerstats::achievements::%player's uuid%::kills::rowOne} isn't set: #from here
event-slot = 10:
{playerstats::mobKills::%player's uuid%} >= 100:
achievementReward(player, 500, 2)
add 1 to {playerstats::achievements::%player's uuid%::kills::rowOne} #to here is repeated