|Full name||Carlos Javier Acuña Caballero|
|Date of birth||23 June 1988|
|Place of birth||Encarnación, Paraguay|
|Height||1.75 m (5 ft 9 in)|
|Ratchaburi Mitr Phol|
|2001–2002||22 de Septiembre|
|2007–2008||→ Salamanca (loan)||21||(1)|
|2008–2013||Real Madrid B||26||(7)|
|2010–2011||→ Recreativo (loan)||12||(1)|
|2011–2013||→ Girona (loan)||56||(21)|
|2013–2014||→ Watford (loan)||9||(0)|
|2014||→ Osasuna (loan)||16||(3)|
|2015–2016||→ Mallorca (loan)||20||(0)|
|2017–||Ratchaburi Mitr Phol||0||(0)|
|* Senior club appearances and goals counted for the domestic league only and correct as of 10 February 2017.
Acuña was born in Encarnación. In 2004, he helped Paraguay win the Under-16 South American Championship, also topping the goal charts. He was immediately bought by Cádiz CF of Spain for a club record of around 100 million pesetas, but had to wait one year in the sidelines, however, to make his official debut, as the Andalusians already had its foreign-players quota full.
From 2006 to 2008, Acuña represented Cádiz and UD Salamanca, both in the second division (the latter on loan). On 16 December 2008, Real Madrid confirmed an agreement for the transfer of the player for five years; he was immediately sent into the B-side, in the third level.
Subsequently, Acuña played three seasons in the Spanish second level, with Recreativo de Huelva and Girona FC. He scored a career-best 17 goals – plus one in the unsuccessful promotion playoffs – with the latter in the 2012–13 campaign.
After seeing out his contract at Real Madrid, Acuña was signed by Serie A's Udinese Calcio in late June 2013. However, within a matter of weeks, he moved to sister club Watford on a three-year contract. He scored his first goal for his new team on 24 September, in a 2–3 home loss to Norwich City for the season's League Cup.
- El delantero Carlos Acuña, de 16 años ya está en Cádiz dispuesto a 'triunfar en España' (16-year-old striker Carlos Acuña already in Cádiz, willing to "make it big in Spain"); Terra, 16 February 2005 (Spanish)
- Nuevo jugador del Castilla (New Castilla player); Real Madrid CF, 16 December 2008 (Spanish)
- Javier Acuña, presentado en el Recreativo de Huelva (Javier Acuña, presented with Recreativo de Huelva); Diario ABC Color, 30 August 2010 (Spanish)
- Javier Acuña, cedido al Girona (Javier Acuña, loaned to Girona); Defensa Central, 13 July 2011 (Spanish)
- El "Toro" vuelve a Girona ("Toro" returns to Girona); Girona FC, 10 August 2012 (Spanish)
- El Girona revive gracias a los goles del 'Toro' Acuña (Girona relives thanks to 'Toro' Acuña goals); Marca, 24 December 2012 (Spanish)
- 1–0. Un gol de Acuña asegura la promoción al Girona (1–0. Acuña goal assures promotion playoffs to Girona); Liga BBVA, 26 May 2013 (Spanish)
- Abdi, Battocchio, Angella and Fabbrini just four of eight arrivals...; Watford FC, 19 July 2013
- "Watford 2–3 Norwich". BBC Sport. 24 September 2013. Retrieved 12 January 2014.
- "Osasuna confirm Javier Acuña loan signing". Inside Spanish Football. 9 January 2014. Retrieved 9 January 2014.
- "El Betis se recrea en su propia desdicha" [Betis finds new ways of being unfortunate] (in Spanish). Marca. 12 January 2014. Retrieved 12 January 2014.
- "Javier Acuna leaves Watford to rejoin first team Club Olimpia Asuncion for undisclosed fee". Watford Observer. 1 August 2014. Retrieved 1 August 2014.
- "El Mallorca anuncia el fichaje del paraguayo Javier Acuña" [Mallorca announces the signing of Paraguayan Javier Acuña] (in Spanish). RCD Mallorca. 30 July 2015. Retrieved 30 July 2015.
- "El Paraguayo Javier Acuña, segundo fichaje del C. D. Numancia 2016–17" [Paraguayan Javier Acuña, second signing of C. D. Numancia 2016–17]. CD Numancia. 17 June 2016. Retrieved 18 June 2016.