Kill 100 ufos

Kill 500 ufos

Kill 2k ufos

Kill 10k ufos

Kill 50k ufos

4-9 kills per time

10-20 kills per time

21+ kills per time

Firing accuracy <= 3%

Firing accuracy >= 90%

Firing accuracy == 100%

Finish level with 1hp

Finish level without damage

10 deaths in row

Kill self

Kill self by nuke

Use 9+ nukes per level

Use 16+ nukes per level

Use 666+ nukes