Here is the full list of all 9 TECHPACK achievements.
Start TECHPACK for the first time
On Singleplayer, get a perfect bonus score
Get 10,000 points and gain an extra life
Hit an enemy with a trapdoor
With Blueninja, get killed by Cindy
Hit an enemy with Indo's Dust cloud ability
Copy Cindy's Ability
Reach Level 256
Blow up Violet with Red's Ability