The achievements are simpler on this game compared for the first, there's just one for completing each level. I did all of them on hard mode, and cannot confirm whether they unlock on normal mode.

Solutions were tested at 60fps (except level 22). Higher may result in a different outcome.

↓ → ↑ ← → ← ↑

↑ ↓ → ← → ← ↓

↑ → ↓ ↑ → ← → ← ↑

↑ ← ↓ ↑ → ↑ ↓ → ← ↓ → ← → ← ↑

↓ ← ↓ ↑ ↓ → ← ↑ ← ↓ → ← → ↑

← ↓ → ↑ ↓ ↑ ← ↓ → ← ↑ → ↓ ← ↑ ← → ← ↓

← ↑ → ↓ ↑ → ↓ ↑ ← ↓ → ← ↑ → ← → ↑

↓ ← ↑ → ↓ ↑ ↓ → ↑ ← → ← → ← ↑

← → ↑ ↓ → ← → ↑ ↓ ↑ → ↑ ← ↓ → ↑ ← ↑ → ↓ →

→ ↑ ← ↑ ← ↓ ↑ ← ↑ → ↓ ← ↓ ↑ → ← → ↓ → ↓

↑ → ↓ → ↓ ↑ → ← ↑ ↓ ← → ← → ↑ ↓ → ← ↑

↓ ↑ → ← → ← ↓ ← ↑ ↓ ↑ ↓ ↑ → ↓ → ↑ ← → ↑ ← ↓ → ← → ↑

↑ ↓ ↑ → ← → ↑ ↓ ↑ ↓ ← → ↑ ← ↓ ← → ← → ↑ ↓ ↑ ↓ ↑ ← → ↓ ← → ← ↑

→ ← ↑ → ↓ ↑ ↓ ← ↑ → ↓ ↑ ← → ← → ← ↓ ↑ → ← ↑ → ↓ ↑ ↓ ↑ → ← ↑

↑ ↓ → ← → ← ↓ ↑ ↓ ← → ↑ ↓ → ↑ ← → ← → ↓ → ↑ ↓ ↑ ← → ↑ → ↓ ↑ → ↑ ← ↓ ← ↓

← → ↑ ↓ ← ↑ ↓ ↑ → ↓ ↑ → ↓ ← → ↓ ↑ ↓ ← → ↑ → ← ↓ → ← ↑

→ ↑ ← ← ↑ → ↓ ↑ ↓ ↑ → ↓ → ← ↓ → ← ↑ ↓ → ← → ← ↓ → → ↑

← ↑ → ↓ ← ↑ ← ↓ ← → → ↓ ↑ ↑ → ← ← ↓ ↑ ← ↑ → ← ↓ ↑ ← ↓ ↑ → ↑ ↓ →

↓ → ↑ ← → ← ↓ ↑ → ↓ ← ← ↑ ↓ ↑ ↓ ↓ → ← ↓ → ↓ → ↑ ↑ → ↑ ← ← ↑ ← → ↓ ↑ ↓ ↑ → ↓ ← ↓ ↓ → ← → ↓ ← ← ↑

↑ → ↓ ← ↑ ↓ ↑ → ← ← ↑

↑ → ↓ → ↓ ↑ → ↑ → ← → ↓ ← ↑ → ← ↑ ↓ → ↓ ↑ → ↓ → ↑ ← ↑ → ↑

This solution only works at 30fps. It's the intended solution provided by the developer. The best I could get at 60fps was 52 steps, but this level has a 51 step limit.

↓ → ← ↓ ← ↑ → → ↑ ↓ ↑ ↑ → ← ↓ ← → ← ↓ ↑ ↑ ← → ↓ ↑ → ↓ ← ↑ → ↑ → ↓ ← → ↓ → ← ← ↑ ↓ ↓ ← → ↑ → ↑ → ↑