I have created a world that lets you get the Adventuring Time and Sail the 7 Seas achievement.
All you do is you turn to the opposite direction of the signs and step on every
glass block that was placed. By doing this, the game will see that you walked through all the blocks with the biomes in it and you will get those 2 achievements.
World Link (.MCPACK) : https://drive.google.com/file/d/15IVJLcYLBS1CznHLZb0OjWTo_Ye...
(This is not cheating, it may look like it but Minecraft allows you to import worlds without directly going into the files.)