// initialize the achievement system.
void achievement_init();

// close the achievement system.
void achievement_close();

// gain the achievement with the given name.
// Only awarded if euclid equals euclideanAchievement.
void achievement_gain(const char*, bool euclideanAchievement = false);

// gain the achievement for collecting a number of 'it'.
void achievement_collection(eItem it, int prevgold, int newgold);

// this is used for 'counting' achievements, such as kill 10
// monsters at the same time.
void achievement_count(const string& s, int current, int prev);

// gain the victory achievements. Set 'hyper' to true for
// the Hyperstone victory, and false for the Orb of Yendor victory.
void achievement_victory(bool hyper);

// gain the final achievements. Called with really=false whenever the user
// looks at their score, and really=true when the game really ends.
void achievement_final(bool really);

// display the last achievement gained.
void achievement_display();

// achievements received this game
vector<string> achievementsReceived;