Originally Posted by Mr1721
I will confirm this.. From chapters 1-7 in the light world i collected all bandages, did all warp zones and completed it A+. For the dark world i did the exact same thing except.. it gave me the 100% achievement after completing 7-18x so i was like "oh cool... let me look at my stats for the game" it showed Total progress 100%
Light World 100%
Dark World 98%
i guess the total progress goes over 100% giving you the achievement.
same happened to me except I got 99% on Dark world. it seems like the total progress will be calculated from the average progress of light and dark world.
100+99 = 199
199/2 = 99.5
the game rounds up to 100% and you get the achievement
and after I beat the last two cotton levels I got 103% on cotton alley and had a total progress of 101%