Here is the full list of all 25 Soulsland: Last Fight achievements.
Find captured souls Castle Ruins
Find captured souls desert
Find captured souls flying town
Play flying town
Find captured souls arena
Play arena
Find golden skull dark dungeon map
Find captured souls dark dungeon
Find captured souls land of grass
Play land of grass
Find captured souls windmill area
Play Windmills area
Find captured souls coral town
Play coral town
Find golden skull desert map
Play desert map
Find captured souls dungeon
Play dungeon
Find captured souls Old Town
Play Old Town
Find golden skull tropic village
Find captured souls tropic village
Play tropic village
Play dark dungeon
Play Castle Ruins