Ribbons
Ribbons are awarded once for a feat: a kill streak, an event, a milestone. Profiles show which ribbons a player holds, and Z8Games publishes how many players hold each one, which is how OpenCF ranks the rarest. There are 147 ribbons on record.
Achievements
Achievements have stages. Each stage asks for more (more kills with a class, more wins in a mode) and some stages pay a reward.
Weapon collections
A collection is a set of weapons. Own every weapon in the set and you complete it, which usually unlocks a name card. OpenCF tracks 278 collections, what each holds, and who finished it first.
Ribbons Achievements Collections