Key Explorer

Ready for the junkyard

Complete the first stage ('Zeus Sector') at any difficulty level

---

Piece of rock

Complete the third stage ('Ethia Ruins') at any difficulty level

---

System liberated

Complete the fifth stage ('Turady Deep Sea') at any difficulty level

---

Not that difficult after all

Complete the seventh stage ('Van Krist Labs') at any difficulty level

---

Survivor

Clear challenge 'Survivor'

---

Collector

Clear challenge 'Collector'

---

Action Fan

Clear challenge 'Action Fan'

---

Chain Expert

Clear challenge 'Chain Expert'

---

Profiler

Clear challenge 'Profiler'

---

Rating Expert

Clear challenge 'Rating Expert'

---

Lucky Number 7

Collect an accumulated total of 77777 chain rings

---

Can't hide from me

Shoot down a rare enemy

---

Challenge Master

Unlock and successfully pass 12 or more base challenges

---

Speed Gunner

Clear challenge 'Speed Gunner'

---

Stage Keys

Clear challenge 'Stage Keys'

---

Speed Collector

Clear challenge 'Speed Collector'

---

Rank Master

Clear challenge 'Rank Master'

---

Kill Collector

Clear challenge 'Kill Collector 1'

---

Score Collector

Clear challenge 'Score Collector 1'

---

Hellfire

Clear challenge 'Hellfire'

---

The Last Chapter

Complete the tenth stage ('Inner Core') at any difficulty level

---

No time to waste

Defeat the final boss in stage eight in under 115 seconds

---

King of unlockables

Unlock at least seven specials

---

Key Master

Collect all 15 secret keys in stage eight through ten

---