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Method to obtain the Return To Sender achievement
Find a ghast in the Nether. This is quite easy, since the ghast's call can be heard even if the ghast is very far away. When a player finds the ghast, wait until it fires a fireball at a player, and then use (defaults to left click) a sword to deflect the fireball. This may require multiple tries, as well as awareness of the surrounding terrain. If a player hits a ghast with its own fireball, it will immediately be killed regardless of how much health the ghast may have. At this point, a player will have unlocked the Return to Sender achievement.