100%

To collect the 100% achievement, collect everything else in the game. This includes: There are some things that are ignored by the 100% achievement, these include: NOTE: The 100% achievement is reset after a new update. This means that when new things are added, you will lose the achievement until you get those new things. In a less major update, the achievement can be reclaimed.
 * All Cards (Including Achievement Cards, Special Cards and Objects)
 * All other Achievements
 * All Backgrounds
 * The 100% achievement.
 * The Tom's Birthday achievement.
 * The Christmas achievement.
 * All Mykis.
 * The Cory Bottle card.

Reward
When collecting the reward, it will take you to the Credits. The credits take around 2 minutes and cannot be exited. A tip is too equip idle cards because they will still be active. The credits display a different message at the end for 100%ing the game.

The reward card is Cory Bottle.