Here is the full list of all 18 Harpoon Shooter! Nozomi achievements.
Watched through the end roll
Received a smile 10 times
Discovered 12 Secrets
Defeated 20000 enemies
Acquired 5 weapons
Collected 2000 balls
Defeated 5000 enemies
Collected 500 balls
Discovered 5 Secrets
Defeated 1000 enemies
Cleared 3 times (all difficulty levels)
Cleared 10 times (all difficulty levels)
Cleared 30 times (all difficulty levels)
Collected 5000 balls
Discovered all Secrets
Received a smile 50 times
Received a smile 100 times
Cleared the Easy mode without getting any sweets (Arcade Mode)