Saving throw 100%(or all chests) (Thronebreaker: The Witcher Tales)

For QUINTA need collected the chests and the achievement.

And I, unfortunately, went through the game before I decided to try Quintets, and now too lazy to replay.

If you have collected all of the chests — that's good. If you execute a bundle, please, do not pass by.
For example,
1. To end the round with 300 points
2. To read all the letters
3. To activate a loyalty ability Mavi 100 times.
4. Kill 10 enemies at the same time.
5. To play 5 characters in one fight.
z.s. In the game there is a reward of find the Easter eggs what you need to find?