Here is the full list of all 18 J.A.C.K. achievements.
Create 5000 solid blocks.
Create 250 curves (Quake 3).
Create 2500 solid entities.
Place 1000 point entities.
Carve 100 solids.
Place 50 decals (Half-Life).
Make 25 solids hollow.
Merge 16 solids in a single Merge operation.
Cut 100 solids using the Clipping Tool.
Split 50 faces.
Triangulate 10 complex solid structures.
Export 100 MAP files.
Save 25 incremental versions of a single project.
Get an "Invalid solid structure" error.
Extract textures (Quake or Half-Life).
Create a path using the Path Tool.
Create a group consisted of 10 nested groups.
Create an effect in Effects Editor (Quake 3).