By performing certain actions with StreetPass and Find Mii, you'll unlock various titles.

Accomplishment	How to unlock
Accomplishment 01	Get a StreetPass tag with a Special Mii (gold pants).
Accomplishment 02	Get 10 StreetPass tags with Special Miis (gold pants).
Accomplishment 03	Meet five male Mii characters in a row in one trip to the plaza gate.
Accomplishment 04	Meet five female Mii characters in a row in one trip to the plaza gate.
Accomplishment 05	Meet the same Mii 10 times.
Accomplishment 06	Collect 100 StreetPass tags in one day.
Accomplishment 07	Meet Mii characters via StreetPass five days in a row.
Accomplishment 08	Meet Mii characters via StreetPass 10 days in a row.
Accomplishment 09	Get a StreetPass tag after a week of no tags.
Accomplishment 11	Meet a Mii on his or her birthday.
Accomplishment 12	Get a "fantastic" rating.
Accomplishment 13	Get 10 "fantastic" ratings.
Accomplishment 14	Get 50 "fantastic" ratings.
Accomplishment 16	Get 1,000 "fantastic" ratings.
Accomplishment 17	Meet Mii characters from a total of two different regions.
Accomplishment 18	Meet Mii characters from a total of three different regions.
Accomplishment 19	Meet Mii characters from a total of five different regions.
Accomplishment 20	Meet Mii characters from a total of 10 different regions.
Accomplishment 21	Meet Mii characters from a total of 20 different regions.
Accomplishment 22	Meet Mii characters from a total of 30 different regions.
Accomplishment 23	Meet Mii characters from a total of 50 different regions.
Accomplishment 24	Meet Mii characters from every region in your country.
Accomplishment 25	Meet Mii characters from a total of two different countries.
Accomplishment 26	Meet Mii characters from a total of three different countries.
Accomplishment 27	Meet Mii characters from a total of five different countries.
Accomplishment 28	Meet Mii characters from a total of 10 different countries.
Accomplishment 29	Meet three in a row, all in one go, who used the same software last.
Accomplishment 30	Receive a personal greeting.
Accomplishment 31	Get one StreetPass tag.
Accomplishment 32	Get 10 StreetPass tags.
Accomplishment 33	Get 50 StreetPass tags.
Accomplishment 34	Get 100 StreetPass tags.
Accomplishment 35	Get 500 StreetPass tags.
Accomplishment 36	Get 777 StreetPass tags.
Accomplishment 37	Get 1,000 StreetPass tags.
Accomplishment 38	Get 2,000 StreetPass tags.
Accomplishment 39	Get 3,000 StreetPass tags.
Accomplishment 40	Get 4,000 StreetPass tags.
Accomplishment 41	Get 5,000 StreetPass tags.
Accomplishment 42	Get 6,000 StreetPass tags.
Accomplishment 43	Get 7,000 StreetPass tags.
Accomplishment 44	Get 8,000 StreetPass tags.
Accomplishment 45	Get 9,000 StreetPass tags.
Accomplishment 46	Get 9,999 StreetPass tags.
Accomplishment 47	Get 10,000 StreetPass tags.
Accomplishment 48	Get 20,000 StreetPass tags.
Accomplishment 49	Get 30,000 StreetPass tags.
Accomplishment 50	Get 40,000 StreetPass tags.
Accomplishment 51	Get 50,000 StreetPass tags.
Accomplishment 52	Get 60,000 StreetPass tags.
Accomplishment 53	Get 70,000 StreetPass tags.
Accomplishment 54	Get 80,000 StreetPass tags.
Accomplishment 55	Get 90,000 StreetPass tags.
Accomplishment 56	Get 100,000 StreetPass tags.
Accomplishment 57	Get 200,000 StreetPass tags.
Accomplishment 58	Get 300,000 StreetPass tags.
Accomplishment 59	Get 400,000 StreetPass tags.
Accomplishment 60	Get 500,000 StreetPass tags.
Accomplishment 61	Get 600,000 StreetPass tags.
Accomplishment 62	Get 700,000 StreetPass tags.
Accomplishment 63	Get 800,000 StreetPass tags.
Accomplishment 64	Get 900,000 StreetPass tags.
Accomplishment 65	Get 999,999 StreetPass tags.
Accomplishment 66	Reach a plaza population of 10.
Accomplishment 67	Reach a plaza population of 50.
Accomplishment 68	Reach a plaza population of 100.
Accomplishment 69	Reach a plaza population of 500.
Accomplishment 70	Reach a plaza population of 1,000.
Accomplishment 71	Reach a plaza population of 2,000.
Accomplishment 72	Reach a plaza population of 3,000.
Accomplishment 73	Get three duplicate Puzzle Swap pieces in a row with Play Coins.
Accomplishment 74	Complete a Puzzle Swap panel.
Accomplishment 75	Complete five Puzzle Swap panels.
Accomplishment 76	Complete seven Puzzle Swap panels.
Accomplishment 77	Complete 10 Puzzle Swap panels.
Accomplishment 78	Make it through a room in Find Mii/StreetPass Quest.
Accomplishment 79	Miss with a sword attack three times in a row in Find Mii/StreetPass Quest.
Accomplishment 80	Deal over 50 damage in a single turn in Find Mii/StreetPass Quest.
Accomplishment 81	Break through a yellow shield in Find Mii/StreetPass Quest.
Accomplishment 82	Break through a light-blue shield in Find Mii/StreetPass Quest.
Accomplishment 83	Make it through a dark room in Find Mii/StreetPass Quest.
Accomplishment 84	Complete Find Mii/StreetPass Quest.
Accomplishment 85	Complete Find Mii/StreetPass Quest twice.
Accomplishment 86	Complete Find Mii/StreetPass Quest five times.
Accomplishment 87	Complete Find Mii/StreetPass Quest 10 times.
Accomplishment 88	Complete Find Mii with 30 or fewer Mii characters.
Accomplishment 89	Make it through a dazzling room in Find Mii II/StreetPass Quest II.
Accomplishment 90	Make it through a fiery room in Find Mii II/StreetPass Quest II.
Accomplishment 91	Make it through an icy room in Find Mii II/StreetPass Quest II.
Accomplishment 92	Make it through a poisonous room in Find Mii II/StreetPass Quest II.
Accomplishment 93	Break through a shadowlight shield in Find Mii II/StreetPass Quest II.
Accomplishment 94	Complete Find Mii II/StreetPass Quest II.
Accomplishment 95	Complete Find Mii II/StreetPass Quest II's secret quest.
Accomplishment 96	Complete Find Mii II/StreetPass Quest II's secret quest twice.
Accomplishment 97	Complete Find Mii II/StreetPass Quest II's secret quest five times.
Accomplishment 98	Complete Find Mii II/StreetPass Quest II's secret quest 10 times.