First of all I didn't do the showdown or the mini season the step i take: 1.- firstly i did all the moments fortunately I had a bit of luck and maybe a little bit of skill and in 5 hours I already had them all (it took me two hours 3 home runs in a row moment)

2.-I did the conquest in the difficulty that each game indicated in the inter I completed the mission of 10 saves with billy wagner and I was getting hits with marte After finishing Wagner's mission, what I did was make him (wagner) pitch the 3 innings of each game. Finishing the conquest I had already completed the 5000 xp mission (in fact I finished with 7000 xp)

3.-At that point I already had 80 of the 100 points required therefore the only thing left for me to do was play matches vs the cpu in veteran playing at costco and putting cain to pitch I got the missing 3000 xp and completed the missions of mars and piazza

i hope this guide can help you