Yes you will. According to Tibia.Fandom the only area that doesn't count for this achievment yes the Sea Seacrest hunting ground.
Obtainable by walking 1,000,000 steps underwater. Confirmed working tiles are Ocean Floor, underwater Marble Floor and underwater Sandstone Floor. Lava crack tiles in the Sea Serpent Area are not counted, as those are also used on land.
Interview with Benjamin Zuckerer - managing director at CipSoftMay 07, 2020
Improving posts is now rewarded with reputation pointsApril 11, 2020