The only two key combinations that triggers the cheater achievement are ctrl+shift+f4(deals blunt damage to all enemies) and ctrl+h(heals yourself).
Other cheats like ctrl+f4(deals blunt damage to only one enemy), ctrl+x, ctrl+shift+h(heals your horse), etc, are completely fine to use and won't trigger the cheater achievement.
Sometimes you may accidentally press one of the key combinations that triggers the achievement. One common example is pressed the "h" instead of "j" when trying to use ctrl+j to halt your horse.