"Beat X without using System Y" is a pretty common achievement though. Half-Life 2: Episode 1 has an achievement that begged me to play the game again: beat the

"Beat X without using System Y" is a pretty common achievement though. Half-Life 2: Episode 1 has an achievement that begged me to play the game again: beat the episode while only firing one shot. Being able to beat a game while not using a core system can be a sign of good game design, or an exceptionally skilled player. Look at Super Mario 64 and speedrunner's ability to finish levels with a single press (but not release!) of the jump button.