Ended Alexei's Ambitions
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You put an end to Alexei's ambitions. However, the Adephagos remains. The battle continues...
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This achievement unlocks after you have defeated Alexei at Zaude. Bear in mind that there is a Secret Mission during this boss fight, as usual.
Alexei is level 54 and has 305,550 HP. He can heal himself with his ice attacks, which comes in handy if you haven't completed the secret mission when he is close to dying. He also loves to use his overlimit and Mystic Arte, so it may help if you don't bring along your weaker characters, such as Estelle and Rita, and instead use Karol and Raven for support/healing.