Here is the full list of all 35 Time Rifters achievements.
Destroy 5,000 enemies with rockets
Create & Upload a Custom Arena
Record a Let's Replay on any Episode
Destroy 500 enemies with the Flak Cannon
Escape every arena in Episode 1
Complete a Let's Replay on any Episode
Play a Custom Arena
Unlocked Experiment mode for Episode 1
Destroy 500 enemies with the Particle Ball
Destroy 500 enemies with rockets
Destroy 500 enemies with the Spread Rifle
Complete 1 Daily Challenge
Create & Upload a Challenge Room
Unlocked Experiment mode for Episode 2
Unlocked Experiment mode for Episode 3
Get 100% on Episode 1
Get 100% on Episode 2
Get 100% on Episode 3
Escape every arena in Episode 2
Escape every arena in Episode 3
Destroy 50,000 enemies with rockets
Destroy 5,000 enemies with the Particle Ball
Destroy 50,000 enemies with the Particle Ball
Destroy 5,000 enemies with the Flak Cannon
Destroy 50,000 enemies with the Flak Cannon
Destroy 5,000 enemies with the Spread Rifle
Destroy 50,00 enemies with the Spread Rifle
Destroy 500 enemies with the Plasma Beam
Destroy 5,000 enemies with the Plasma Beam
Destroy 50,000 enemies with the Plasma Beam
Destroy 500 enemies with the Scatter Pistol
Destroy 5,000 enemies with the Scatter Pistol
Destroy 50,000 enemies with the Scatter Pistol
Complete 10 Daily Challenges
Complete 50 Daily Challenges