Here is the full list of all 29 Ogu and the Secret Forest achievements.
You've arirved at a new unknown world.
You've inserted the 'Sigil of the Sun' to the 'Heart of the World'.
You've inserted the 'Sigil of the Moon' to the 'Heart of the World'.
You've inserted the 'Sigil of the Fire' to the 'Heart of the World'.
You've inserted the 'Sigil of the Earth' to the 'Heart of the World'.
You've inserted the 'Sigil of the Water' to the 'Heart of the World'.
You've inserted the 'Sigil of the Tree' to the 'Heart of the World'.
You've met Bat. The Devine Beast of the Earth.
You've met Rhano. The Devine Beast of the Sky.
You've met Enki. The Devine Beast of the Ocean.
You've heard the truth about the devine beasts from Gota.
You've won 1st place at all the races of the 'Village of Fire'.
You've defeated all of the gient cactus monsters with Mecha Shrew DDAT-G 5000.
You've destroyed the sand castle.
You've cut 1,000 grass.
Failed cooking for the first time.
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You've put pottery on every board of the pottery studio.