Only Three new Turns?

[MyuZero]

I hope this is a mistake but from the achievement list there is only 3 for Coil 2, T1, T2 & T3.

From the full patch note, there is no T9/T4 and it looks like they are not hiding any boss. Sigh...this is really depressing if it is true.

There's probably no meaning to having an achievement for stepping into a 1 room turn like turn 4.