Is this the latest rAthena? If it is so, you need to apply a fix (or wait for PR into master and disable the Achievement feature).
diff --git a/src/map/achievement.cpp b/src/map/achievement.cpp
index 8b20165..7a1207a 100644
--- a/src/map/achievement.cpp
+++ b/src/map/achievement.cpp
@@ -171,13 +171,13 @@ bool achievement_remove(struct map_session_data *sd, int achievement_id)
* @return True on completed, false if not
*/
static bool achievement_done(struct map_session_data *sd, int achievement_id) {
- auto &adb = achievements[achievement_id];
- struct achievement *ach_data = sd->achievement_data.achievements;
+ for (int i = 0; i < sd->achievement_data.count; i++) {
+ if (sd->achievement_data.achievements[i].achievement_id == achievement_id && sd->achievement_data.achievements[i].completed > 0) {
+ return true;
+ }
+ }
- return (std::find_if(adb->dependent_ids.begin(), adb->dependent_ids.end(), [&achievement_id, &ach_data]
- (const int &d) {
- return (ach_data[d].achievement_id == achievement_id && ach_data[d].completed > 0);
- }) != adb->dependent_ids.end());
+ return false;
}
/**
Credits to @Cydh for the fast fix.