In this video, I collect all Hearts, Items, Tentacles, Coins and complete the game with 110%. The collectibles start at around 15:25 in the video, the start shows how to beat the game in 16 runs with no snake kills
The description is misleading as you can actually beat the game with anywhere from 100-110% and get this. you don't necessarily need all Items, Coins and Hearts.
After this video, you should be only missing the achievement for beating Second Run mode.