Here is Videoguide with all 18 Nostradamus Enigmas. In the Spoiler is the Timeline and the Names of all 18.
*** Spoiler - click to reveal ***00:06 - Nostradamus Enigma Aquarius
02:12 - Nostradamus Enigma Aries
03:42 - Nostradamus Enigma Cancer
06:15 - Nostradamus Enigma Capricorn
07:40 - Nostradamus Enigma Gemini
09:24 - Nostradamus Enigma Jupiter
11:00 - Nostradamus Enigma Leo
12:29 - Nostradamus Enigma Libra
14:10 - Nostradamus Enigma Mars
15:44 - Nostradamus Enigma Mercurius
17:25 - Nostradamus Enigma Pisces
20:13 - Nostradamus Enigma Sagittarius
21:45 - Nostradamus Enigma Saturnus
23:39 - Nostradamus Enigma Scorpio
25:07 - Nostradamus Enigma Taurus
26:55 - Nostradamus Enigma Terra
28:40 - Nostradamus Enigma Venus
30:09 - Nostradamus Enigma Virgo
You will need all 18 Enigmas for