Naruto Shippuden Ultimate Ninja Storm Generations is a easy 1000GamerScore, here's a little short overview of my thoughts about the achievements.
-Estimated achievement difficulty:
-Approximate amount of time to 1000:
-Minimum number of playthroughs needed:
-Number of missable achievements:
-Do cheat codes disable achievements?
No cheats (That i know of)
-Does difficulty affect achievements?
-Extra equipment needed?
All You really have to do is play the story, survival, and tournament to get most of the achievements already. It should take about 10-15 Hours to get all the achievements already depending on your skill and difficulty. For the 80% titles, cards, ninja tools and substitution achievements they can all be collected offline. Most likely you can get some titles and cards playing Online.
This is my short little overview of Naruto Generations achievements. I'm glad they taken out the online achievements cause finding a game to beat someone with my poor skill sucks.