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