Secret Agent/Achievements

Secret Agent HD adds several optional achievements to the game, which can be viewed from the title menu. Unlocking them doesn't do anything, but they are linked to Steam/GOG achievements.

Note that if you restart or leave a level without beating it, any achievement progress made in that level is reset, so you cannot "cheat" by repeatedly restarting. However, if you complete an achievement mid-level, it will remain, whether you go on to beat the level or not.