Better synonym for "actionable"?

An improvable item
Augmentable
Progressable

I currently say an item is "blocked" or "unblocked".

How can we unblock X?

What is blocking Y?

We have too many blocking / blocked tasks.

This may work especially well in my field because the term "blocking" means in software development almost what "un-actionable" means in managementese.

Off-topic anecdote: I wondered the same as you, but my motivations were different than yours. I hate management speak for the reason @ghoppe stated - they are often an artificial cluster of meaningless words to pretentiously avoid simplicity (ok I said it much stronger). I will never forget when my non-native English speaking friend laughed when she heard, "So now what you are going to want to do here is X" instead of simply "X". Not management speak, but illustrates what lengths we're willing to take just to use more syllables.

[Update]

I just realized a very common phrase in the corporate world that could easily be used for what you need: "In X's court"?

Is that task in our court?

Means, "is progress of the task currently our responsibility?". If you answer "no", you don't necessarily imply that it's anyone else's responsibility either. So, it doesn't imply whether it's actionable in general or not, but I think in usage this is a very close fit.

I think, like many "managementese" buzzwords, "actionable item" is pretty much devoid of informational content. I would find a more descriptive word milestone, objective, task, or perhaps target and specifically describe the nature of the "item" and why it is "actionable".

This has now become one of our primary objectives.

or

This has now become a task that needs to be completed first.

I don't think there IS a better word. I don't agree that the co-existence of the managerial meaning and the legal meaning is a problem. The two meanings are in different domains, after all. Remember, if we can cope with words that are their own opposites (such as "sanction" - there's a whole thread on this as you all know), we can certaily handle the multiple disparate meanings of "actionable". However, if you INSIST on having a different word, I would go along with "progressable" as given in the answer by mplungjan above. As noted by FumbleFingers, "- a bit "jargonny", but in OP's context it's fine."