Jack-Jack Attack! achievement in LEGO The Incredibles

You'll will unlock Jack-Jack as part of the story in chapter 3 Revelations
Here are his powers

Default baby Jack-Jack powers
Jump for steel baby
Hold for laser eye (use to cut through a golden objects)
Teleport through the void green walls
Hold to multiply Jack-Jack
Hold when able to build something to use telekinesis can also be used on rocks and objects involving mini kits
Hover over water this one is specific to this variation

Jack-Jack Fire powers
Jump for blazing steel baby
Hold for fire stream (also used to cut golden objects)
Set fire to camp fire or specific light-able objects for mini kits usually
Can light up Dark Passages as well

Jack-Jack Monster powers
Jump grand slam
Hold for rage animation (not sure if it counts but try it anyway)
Can bull doze through objects (like Mr. Incredible)

All variations of Jack-Jack can fit through grates
and all three have there own super move a.k.a the hold then tap it a bunch move.
Also it goes without saying but attack and defeat at least one enemy with all three variations of Jack-Jack.

Hope this helps.

I also needed to smash a wall with Jack Jack's Monster powers.Posted by OH NO GAWDZIRRA on 18 Aug 21 at 20:01Bugged here! 😔Posted by andreluigo on 19 Jan 22 at 00:54I followed this video and it unlocked for me: Posted by Pedle Zelnip on 24 Apr 22 at 17:43Followed the vid above and guidance it still won't unlock for me yetPosted by MUFC9899 on 15 Aug 22 at 22:14Make sure you use fire Jack to light up a dark space. That’s the one I needed last to unlock it.Posted by ThinSpirits115 on 07 Aug 23 at 04:56If helps to someone the achievement popped for me after I used the eye laser on one of those walls where you have to draw with laser.Posted by ImAnG31 on 27 Aug 23 at 01:29Just to add I followed numerous videos and the one that I had missed or wasn’t made obvious was by using Jack Jack fire and rolling into a fire, not sure if suit matters but it was Jack Jack diaperPosted by Blondie272 on 31 Aug 23 at 09:40No achievement popped I tried everything...Posted by hibiki13 on 10 Jan at 00:45I do so much of the above it was crazy, including following the multiple youtube videos. No luck. What eventually got it for me was waking through fire as each type in Vigilant Vigilantes pt 1. Finally!Posted by NighthawkJoV on 15 Jan at 14:08You unlock Jack-Jack Parr (Diaper) in Chapter 3. You do not unlock Jack-Jack until Chapter 6.

You can get the achievement using either character. The last one I needed was Illuminate. There is a location near the start of Chapter 6 where you can use that power.

Posted by HolyHalfDead on 09 Feb at 09:30