Please don’t abandon this challenge. Friends and I really love going after heroes’ cute and pixel sprays via achievements. Illari didn’t release with any. Lifeweaver did, and so did every other new hero for OW2.
For consistency sake and the fun it brings for challenge seekers, please tell me you didn’t abandon this.
They did, but they’re in the hero challenges. For some reason. Not achievements
So odd. My OCD hates that. But I can’t thank you enough for letting me know, friend! 
For anyone & everyone: Illari’s achievements are being handled uniquely this season. You will find them via:
Challenges → Hero → Illari → General
Her achievements are:
Solar Flare: Detonate 3 sunstruck enemies after a single use of Illari’s Captive Sun. Reward: Cute Spray.
Perfect Placement: Restore 8,000 health with Illari’s Healing Pylon in a single game. Reward: Pixel Spray.
Reminder: For the Cute spray, you must HIT at least 3 enemies with your initial ultimate attack. Then, each enemy much receive 90 damage in order to activate their sunstruck status effect for the achievement.
Reminder: Fort he Pixel spray, the 8,000 health restore takes place over an entire GAME. Not just a round or a single life. This means that your best bet to get this achievement is on long game modes (Payload, Push, Flashpoint). Note that ANY healing done by the Pylon counts for this achievement, so if you have a D.Va friend, consider asking them to use Micromissiles during downtime to get the healing up; same applies to Pharah, Echo, and any other hero capable of self-harm.
So I guess this is where it ends lol. No more traditional achievements, everything is just gonna be an in-game challenge now.
Not a complaint, this is just odd.
Hihi, also Dx with OCD, also extremely bothered by this 
Actually we just tried this and self-harm damage healed does NOT count towards your Pylon healing.