If you have purchased Dungeon Pack: Seeker of the Deep! DLC from the Marketplace you will be able to obtain the following achievements when you complete the indicated task.

Defeated Killalon - GamerScore 10:
In Professor K's dungeon defeat Killalon.

Reached Conference Area 5B - GamerScore 10:
In Professor K's dungeon go to Conference Area 5B.

Reached Conference Area 10B - GamerScore 10:
In Professor K's dungeon go to Conference Area 10B.

Reached Conference Area 15B - GamerScore 10:
In Professor K's dungeon go to Conference Area 15B.

Reached Conference Area 20B - GamerScore 10:
In Professor K's dungeon go to Conference Area 20B.

Reached Conference Area 25B - GamerScore 10:
In Professor K's dungeon go to Conference Area 25B.

To do this save at any 'Save Point' in the game and return to the 'Main' menu. When you now reload the game your party regardless of their condition before the reload will be restored to full health.

Trade your collected 'Seeds' with the rabbit creatures called Pipots that hide in pots around the world to get the following rewards.

Unlock Adamantis Sword:
Trade 20 Seeds.

Unlock Adaman Ring:
Trade 20 Seeds.

Unlock Earth Charm:
Trade 40 Seeds.

Unlock Power Angle:
Trade 60 Seeds.

Unlock Gigan Brooch:
Trade 80 Seeds.

Unlock Pipot Charm:
Trade 99 Seeds.

When you have completed the game and watched the credits save the file and then select 'Continue' from the 'Save' file.