Actually... If ya'll missed it they also did a write-up about the Logos system in the Developer's Blog
https://na.finalfantasyxiv.com/pr/blog/002559.html

In there they show images where extracting from a single Paralyze L Logogram has a 100% success Rate and results in the Paralyze L Action.

Also, in from the notes.

1) They mention that UNIDENTIFIED Logograms are items that get placed in your character inventory.
2) Once identified the Logograms are stored in the Logos Manipulator.
The Logos Manipulator window shown in the Notes has the notation "11/28" on it... perhaps inferring that there are only 28 total Logograms and the demo user has 11 of them available.
3) The Logos Action Log has spots to record 50 different Logos Actions.

So... we can probably assume that at least 28 actions will have have a 100% success rate to extract from a single Logogram extraction.

But as Cidel posted, that also means that 22 actions can only be produced by combining logograms (perhaps specific combinations) and these will not have 100% success rate for extraction.