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