After updating to Ver 1.18, I searched for various seas and moved to achieve the achievement of "Navigating the Seven Seas", but I can not achieve the achievement.
Is it because "Deep Warm Ocean" was deleted from the biome in Ver 1.18?
As of Ver1.18, I can't confirm the condition of the achievement, so I may not meet the condition yet, but if it can not be canceled due to a bug etc., please correct it.

If possible, be able to see the progress of your achievements.

Supplement: Before upgrading to Ver 1.18, I participated in the world of the player who achieved this achievement and tried to achieve the achievement, and I was able to achieve "Sail the seven seas".

I think it is highly likely that this achievement will not be achieved with the map currently generated in 1.18.