Added fake client checks to include

scripting/include/custom_achievements.inc

@@ -42,7 +42,7 @@ methodmap CustomAchievement {
 	 * Flags the achievement as completed for this client.
 	 */
 	public void Award(int client, bool notify = true) {
-		if (IsClientAuthorized(client)) {
+		if (!IsFakeClient(client) && IsClientAuthorized(client)) {
 			this.AwardToAccountID(GetSteamAccountID(client), notify);
 		}
 	}
@@ -62,7 +62,7 @@ methodmap CustomAchievement {
 	 */
 	public void FetchMetadata(int client, AchievementMetadataCallback callback,
 			any data) {
-		if (IsClientAuthorized(client)) {
+		if (!IsFakeClient(client) && IsClientAuthorized(client)) {
 			this.FetchMetadataByAccountID(GetSteamAccountID(client), callback, data);
 		}
 	}
@@ -77,7 +77,7 @@ methodmap CustomAchievement {
 	 * client.
 	 */
 	public bool StoreMetadata(int client, const char[] metadata) {
-		if (IsClientAuthorized(client)) {
+		if (!IsFakeClient(client) && IsClientAuthorized(client)) {
 			return this.StoreMetadataByAccountID(GetSteamAccountID(client), metadata);
 		}
 		return false;