1. 1st StreetPass tag with a Special Mii.
2. 10th StreetPass tag with a Special Mii.
3. Met five male Mii characters in a row in one trip to the plaza gate.
4. Met five female Mii characters in a row in one trip to the plaza gate.
5. Met the same Mii 10 times.
6. Collected 100 StreetPass tags in one day.
7. Met Mii characters via StreetPass five days in a row.
8. Met Mii characters via StreetPass 10 days in a row.
9. First StreetPass tag in a while.
10. First StreetPass tag in AGES.
11. Met a Mii on his or her birthday.
12. Got a "fantastic" rating.
13. Got 10 "fantastic" ratings.
14. Got 50 "fantastic" ratings.
15. Got 100 "Fantastic" ratings.
16. Met Mii characters from a total of two different regions.
17. Met Mii characters from a total of three different regions.
18. Met Mii characters from a total of five different regions.
19. Met Mii characters from a total of 10 different regions.
20. Met Mii characters from a total of 20 different regions.
21. Met Mii characters from a total of 30 different regions.
22. Met Mii characters from a total of 50 different regions.
23. Met Mii characters from every region in your country.
24. Met Mii characters from a total of two different countries.
25. Met Mii characters from a total of three different countries.
26. Met Mii characters from a total of five different countries.
27. Met Mii characters from a total of ten different countries.
28. Met three in a row, all in one go, who used the same software last.
29. Received a personal greeting.
30. 1st StreetPass tag.
31. 10th StreetPass tag.
32. 50th StreetPass tag.
33. 100th StreetPass tag.
34. 500th StreetPass tag.
35. 777th StreetPass tag.
36. 1000th StreetPass tag.
37. 2000th StreetPass tag.
38. 3000th StreetPass tag.
39. 4000th StreetPass tag.
40. 5000th StreetPass tag.
41. 6000th StreetPass tag.
42. 7000th StreetPass tag.
43. 8000th StreetPass tag.
44. 9000th StreetPass tag.
45. 9999th StreetPass tag.
46. Plaza population reached 10.
47. Plaza population reached 50.
48. Plaza population reached 100.
49. Plaza population reached 500.
50. Plaza population reached 1000.
51. Plaza population reached 2000.
52. Plaza population reached 3000.
53. Got three identical Puzzle Swap pieces in a row with ([-]) Play Coins.
54. Completed a Puzzle Swap panel.
55. Completed five Puzzle Swap panels.
56. Completed seven Puzzle Swap panels.
57. Completed 10 Puzzle Swap panels.
58. Made it through a room in Find Mii.
59. Missed with a sword attack three times in a row in Find Mii.
60. Dealt over 50 damage in a single turn in Find Mii.
61. Broke through a yellow shield in Find Mii.
62. Broke through a light-blue shield in Find Mii.
63. Make it through a dark room in Find Mii.
64. Completed Find Mii.
65. Completed Find Mii twice.
66. Completed Find Mii five times.
67. Completed Find Mii ten times.
68. Completed Find Mii with 30 or fewer Mii characters.
69. Made it through a dazzling room in Find Mii II.
70. Cooled the fiery room in Find Mii II.
71. Made it through a icy room in Find Mii II.
72. Made it through a poisonous room in Find Mii II.
73. Broke a Shadowlight shield in Find Mii II.
74. Completed Find Mii II.
75. Completed Find Mii II's secret quest.
76. Completed Find Mii II's secret quest twice.
77. Completed Find Mii II's secret quest five times.
78. Completed Find Mii II's secret quest 10 times.

Some of these I can game by taking advantage of local store demo units. Others will require a few more trips to anime/comic/scifi/gaming/etc. conventions. A few of them will take a lot of effort or some dumb luck.

Help me fill in the ??? lines! Thanks to everybody who helps!

Notes:
#27 apparently may not appear in all countries

69)Made it through a dazzling room in Find Mii II.
72)Made it through a poisonous room in Find Mii II.
73)Broke a Shadowlight shield in Find Mii II.


Thats all I've got that you're missing =\

the 6th,7th and 8th Achievements are complete balls. How do they expect me to get 100 StP tags in one day when i can barely get 1 in 3 months and 10 in one day on Disney World? And with this luck, how am i going to Streetpass for 10 days in a row? .-.

__________________
Nintendo ID: DarkKRPG

Anime/Gaming conventions are the only way I can think to. =\

BTW, you got something wrong on your list:
You put the 27th achievement on the 28th, causing all of the others to move to the wrong number as well.
27 is "Meet three in a row, all in one go, who used the same software last" while 28 is "Recieved a personal greeting"
Also, there's only 77 achievements, not 78.

Yeah, but since i live on Mexico where i can barely get one streetpass and i don't think there's any gaming/anime events here, i'm screwed.

__________________
Nintendo ID: DarkKRPG

I just double checked, there is a ??? between "three in a row" and "personal greeting", and there are 78. Do people in Mexico not get to have #27? (Thus moving all the others up one).

Mn....that may be the case. Let me change my region settings to see if this is an issue with Mexico ( I didn't get the little white globe on the Streetpass Plaza either)

EDIT: I just checked the Streetpass Plaza after i changed my region to US. The "Streetpass Map" appeared and there's 78 achievements. Looks like the achievement 27 is missing in my country.

__________________
Nintendo ID: DarkKRPG

70. cooled the fiery room in streetpass quest 2!
74, cleared sreetpass quest 2!

dang, this IS going to be impossible...

__________________
I am the creator of the hit horror game RESIDENT REGGIE.

57. Completed 10 puzzle swap panels