Add AchievementEvent

Allows modders to react to players receiving achievements, and cancel
them.

Fix indentation

More shortening

Down to one line...

Remove newline

src/main/java/net/minecraftforge/event/entity/player/AchievementEvent.java

@@ -0,0 +1,20 @@
+package net.minecraftforge.event.entity.player;
+
+import net.minecraft.entity.player.EntityPlayer;
+import net.minecraft.stats.Achievement;
+import cpw.mods.fml.common.eventhandler.Cancelable;
+import cpw.mods.fml.common.eventhandler.Event;
+
+/**
+ * When the player receives an achievement. If canceled the player will not receive anything.
+ */
+@Cancelable
+public class AchievementEvent extends PlayerEvent {
+
+    public final Achievement achievement;
+    public AchievementEvent(EntityPlayer player, Achievement achievement)
+    {
+        super(player);
+        this.achievement = achievement;
+    }
+}